As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: DEFECT FOUND DURING RON MAINTENANCE, AIRCRAFT DID NOT MAKE ITS SCHEDULED FLIGHT IN THE MORNING. LP346657 ITEM 3 : 10WL FAULT DURING EPSU TEST. CORRECTIVE ACTION: REMOVED AND REPLACED 10WL BATTERY IN REF TO AMM 33-51-38-000-002-A AND AMM 33-51-38-400-002. NO HELP, SEE LP346658 ITEM 1 (REPLACEMENT OF THE L1 SLIDE) FOR CORRECTIVE ACTION. /END//