# Maintenance Day

## Getting Your Augmentations Serviced at a Shelf Clinic

The sign says CHROME CHECK — WALK-INS WELCOME, but the wait time written on the board beneath it says 2:40, which means two hours and forty minutes, and the twelve people sitting in the waiting room say that the board is optimistic. The clinic occupies the ground floor of Block 9's residential tower, a space that was designed as a retail unit and has been converted with the minimum investment necessary to meet health governance standards. The walls are clinic-white polymer over retail-beige concrete. The floor is scuffed by a decade of augmented feet. The chairs are the same injection-molded polymer found in every waiting room in the Shelf — rated for 120 kilograms, which is insufficient for any patient with bilateral leg augmentations, which is why the corner bench is reinforced with welded scrap metal and reserved for the heavily chromed.

The intake process is automated and personal simultaneously. Your BCI handshakes with the clinic's diagnostic system the moment you cross the threshold, uploading your augmentation registry, your maintenance history, your power cell data, and your payment tier. The system knows what you have, when it was installed, and when it was last serviced. It calculates a priority score based on urgency, and if your power cells are below 20% or your joint calibration has drifted beyond tolerance, you jump the queue. Everyone understands this. Nobody resents it. Having your arm stop working in the waiting room is the only thing worse than waiting.

The mechanic — they call themselves technicians, but the Shelf calls them mechanics, and the Shelf is right because the work is mechanical in the truest sense — is a woman named Fen. She is fifty-two, unaugmented, and her hands are the most precise instruments in the clinic. The diagnostic suite uses sensors and algorithms. Fen uses touch. She grips your chrome hand and feels the play in the joints. She flexes your wrist and listens for the specific grinding that means bearing wear versus the clicking that means actuator misalignment. She presses the interface zone where chrome meets flesh and watches your face, because the flinch tells her about nerve impingement that the sensors miss. The diagnostic suite is faster. Fen is better. Both are used. The suite for documentation. Fen for truth.

The tests are a catalogue of what you are. Grip strength: the chrome hand crushes a dynamometer while the display shows newtons and the mechanic watches for asymmetry between the commanded force and the delivered force. Reflex response: a sensor tap on the joint while the BCI measures latency between the nerve signal and the actuator response — healthy is under 15 milliseconds, concerning is 15 to 25, and over 25 means the neural interface is degrading. Power cell capacity: a full discharge-charge cycle that takes forty minutes and tells you how much of your arm's original battery life remains. The number only goes down. Every maintenance visit is a reminder that your augmentation is aging, that the chrome you carry is not permanent but borrowed, that one day the power cell will hold too little charge to be useful and you will need a replacement you probably cannot afford.

The bill arrives on your BCI as you walk out the door. The clinic charges Φ8 for a standard maintenance check, Φ15 for bearing replacement, Φ25 for actuator recalibration, and Φ120 for a power cell swap. Your daily Quanta allocation is Φ12. The math is the same math that governs everything in the Shelf — technically possible, practically crushing. You pay the Φ8. You will come back when the bearings fail. You will find the Φ15 somewhere. You will not think about the power cell until you have to, and when you have to, you will think about nothing else. Fen watches you leave. She has seen this calculation performed on a thousand faces. She does not say what she knows, which is that the maintenance interval recommended by the manufacturer is every six months, and her average patient comes in every fourteen, because the math only works if you skip every other visit and hope that the chrome holds. The chrome usually holds. Usually is the most expensive word in the Shelf.