As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY MASTER RELAY PRIMARY COIL FAILED (SHORTED), HAD NO CIRCUIT PROTECTION. CONTROL WIRE TOOK HEAVY CURRENT AND BURNED THE LENGTH OF FUSELAGE TO MASTER SWITCH AND THEN TO GROUND. RELAY HAD DAMAGE FROM HEAVY CURRENT DRAW. INSPECTED WIRE BUNDLE, REPLACED WIRE WITH NEW. REPLACED RELAY AND DIODES WITH NEW.