As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SINCE THE DIODE FAILED, A DIRECT SHORT TO GROUND OCCURED. CAUSING THE BATTERY CIRCUIT WIRING TO BURN OFF ITS SHIELDING AND THE DIODE PIG TAIL FROM X1 TO X2 ON THE RELAY HEATED UP TO THE POINT OF BREAKING, FLAME WAS PRESENT. THE BATTERY SWITCH WAS NOT DAMAGED, NOR WAS THE RELAY. (TC NR 20070202006)