What was found
AIRCRAFT WAS GROUNDED: DURING TROUBLESHOOTING OF EMERGENCY POWER SUPPLY UNIT 10WL MAINTENANCE FOUND BATTERY INOPERATIVE. REPLACED BATTERY FOR EMERGENCY POWER SUPPLY UNIT 10WL PER AMM 33-51-18.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT WAS GROUNDED: DURING TROUBLESHOOTING OF EMERGENCY POWER SUPPLY UNIT 10WL MAINTENANCE FOUND BATTERY INOPERATIVE. REPLACED BATTERY FOR EMERGENCY POWER SUPPLY UNIT 10WL PER AMM 33-51-18.