[Al Skierkiewicz]

There are a few things that can go wrong on the PD. Most are due to abuse. A hard drop can shake one of the larger components loose from the board or a short on one of the power supply lines can cause the current limit device to fail. You can repair the board under
R65 M. Devices may be repaired, provided the performance and specifications of the component after the repair are identical to those before the repair.
Be prepared that the components are surface mount and that requires a little experience to repair and replace. It is also possible that metallic debris has entered the PD and it needs to be cleaned. The PD is easy to open when it is not on the robot.