As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: REFERENCE LP178762 #1 EPSU BATTERY (12WL) FAILED TEST. AIRCRAFT WAS NOT GROUNDED AS A RESULT OF THE SDR REPORTABLE EVENT, SCHEDULED RON HEAVY CHECK. CORRECTIVE ACTION: REMOVED AND REPLACED EPSU BATTERY (12WL) IAW AMM 33-51-38-000-002-A/33-51-38-400-002-A. OPS CHECK GOOD. AIRCRAFT WAS RETURNED TO SERVICE. /END/.