As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTICED AN ELECTRICAL ARCING WHEN PUSHING ON ANNUNCIATOR PANEL DURING A NIGHT FLIGHT. FOUND A LIGHT ASSY MOUNTED BEHIND ANNUNCIATOR PANEL, HAD INSUFFICIENT CLEARANCE TO THE SOLDER JOINT ON THE UPPER LEFT ANNUNCIATOR LIGHT. RECOMMEND AN INSPECTION IN THIS AREA AND REMOVAL OF THE SPACER ON THE LIGHT ASSY SHAFT AND/OR SHIMMING WITH WASHERS OF THE ANNUNCIATOR PANEL AT THE TWO MOUNTING POINTS TO ACHIEVE SOME CLEARANCE.