As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: LP1241800 ITEM 1: DURING OVERNIGHT MAINTENANCE, EPSU SYS TEST FAILED DUE TO EPSU 11WL FAULT. CORRECTIVE ACTION: REMOVED AND REPLACED EPSU 11WL, DUE TO FAULTING PERFORMED EPSU SYS TEST, TEST PASSED. REF AMM 33-51-38-000-001-A AND AMM 33-51-38-400-001-A. AIRCRAFT RETURNED TO SERVICE BY 0630 HAD A 2054 SCHEDULED DEPARTURE TIME.