As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) OVERVOLTAGE RELAY INCORRECTLY WIRED - 'BATTERY' AND 'LOAD' LEADS TRANSPOSED CAUSING OVERVOLTAGE RELAY TO MALFUNCTION - LOSS OF BATTERY VOLTAGE - LOGBOOK FAILED TO REVEAL ANY WORK CARRIED OUT IN THIS AREA - PERSONNEL/MAINTENANCE ERROR