[EricVanWyk]

This is likely a wiring problem, or at least started as one.

Isolate the issue by removing all circuit breakers from the PD except the one that powers the DSC. Check to see if the buzzing / flashing goes away. If it does, re-insert breakers one at a time until the problem comes back. Examine the wiring in that branch and look for shorts to the chassis. Remember, the Banebots 775 motor often shorts to the case.