What was found
FAULT HAPPENED DURING RON MAINTENANCE, SO DID NOT CAUSE A FLIGHT DELAY. DISCREPANCY: LP1263893 ITEM 3; DURING EPSU SYS TEST UNIT 11WL FAULTED. AFTER RESET OF UNIT 11WL, PERFORMED OPS CHECK OF EMERGENCY POWER SUPPLY UNITS BY BITE-CHECK PER AMM 33-51-00-710-001-A. OPS CHECK GOOD AT THIS TIME, A/C OK FOR SERVICE.