As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU BATTERY 11WL EMER L FAILED TEST, AIRCRAFT WAS NOT GROUNDED AS A RESULT OF THE SDR REPORTABLE EVENT, SCHEDULED HEAVY CHECK. REMOVED AND REPLACED EPSU BATTERY (11WL) IAW AMM 33-51-38-000-002-A/33-51-38-400-002-A. OPS CHECK GOOD. AIRCRAFT WAS RETURNED TO SERVICE.