A button doesn't respond, double-presses, or the R2/L2 trigger doesn't go all the way.
Dirt or liquid on the membrane, or a broken button ribbon. On the DualSense, the adaptive trigger motor.
Contact cleaning or a new membrane, ribbon or trigger mechanism.
It depends on the model and on what we find inside, so we quote each repair individually. The diagnosis fee depends on the device, and you approve the exact repair price before any repair starts. If it can't be fixed, you only pay the diagnosis.