As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TROUBLESHOOTING OF THE INOPERATIVE AIR CONDITIONING SYSTEM IT WAS DISCOVERED THE WIRES IN WERE DAMAGED IN THE CIRCUITS BETWEEN OVERHEAD PANEL 12VE, CP104 AND THE CIRCUIT BREAKERS IN ELECTRICAL PNL ASSY PN 540090-1. IT WAS NOTED UPON INITIAL TROUBLE SHOOTING NONE OF THE CIRCUIT BREAKERS WERE POPPED. ARCING WAS NOTED IN THE ELECTRICAL PANEL.