As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER EPSU BITE TEST, THERE IS A EPSU BATTERY FWD L FAULT (10WL) AND EPSU BATTERY EMER L FAULT (11WL). REMOVE AND REPLACED EPSU BATTERY FWD L (10WL) AND EPSU BATTERY EMERGENCY (11WL) IAW- AMM-33-51-38-000 -002-A /33-51-38-400-002-A. PERFORMED OPS TEST REF AMM-33-51-00-710-006, OPS CK NORMAL.