Waterproof Control, Replacement of waterproof parts, Replacement of battery or battery unit (if applicable), Disassembly, cleaning, lubrication of the mechanism, replacement of worn parts of the mechanism or the entire mechanism, Adjustment of gait accuracy , Calibration and control of operation, Professional ultrasonic cleaning of the case and bracelet or optionally depending on the wear of the case and bracelet with the customer’s consent we polish the watch mechanically.