As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, CIDS EMEERGENCY LIGHT BITE FAILS FOR 11WL AND 12WL; REF N/R 440542-43013 - REMOVED AND REPLACED 11WL + 12WL EPSU BATTERY IAW AMM 33-51-38-000-002A AND 33-51-38-400-002A. OPS TEST GOOD IAW AMM 33-51-38-700-002A SUBTASK 33-51-38-710-052-B.