As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU BATTERY FWD L FAULT ON CIDS EMERGENCY LIGHT TEST. ATA 33-51-38. PERFORMED FAULT ISOLATION IAW TSM 33-51-00-810-802-A. STEP 4. A. (1) REQUIRES BATTERY REPLACEMENT WHEN RED BATTERY FAULT LED IS DISPLAYED ON EPSU BATTERY. PERFORMED SYSTEM RESET, EPSU BATTERY FWD L CLEARED, REPLACED BY EPSU BATTERY EMER L. PERFORMED EPSU BATTERY BITE CHECK IAW AMM 319-100 AMM 33-51-00-710-001-A. OPS CHECK GOOD.