What was found
DURING HEAVY MAINTENANCE, INOPERABLE EPSU, EMERGENCY POWER SUPPLY UNIT 12WL IN PASSENGER CABIN. R & R EMERGENCY POWER SUPPLY UNIT EPSU FIN (12WL), IAW AMM 33-51-38-000-001-A AND AMM 33-51-38-400-001-A. PERFORMED OPERATIONAL CHECK OF THE EPSU, IAW AMM 33-51-00-710-001-A. TEST IS OK. TOOL USED BONDING METER P/N T477W S/ N 2073 DUE DATE: SEP/30/2021. REF AEROMAN N/R2020-359482 W/O 2020 160/1.