As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, AFT CENTER ISLE EMERG. LIGHT AND AFT GALLEY CENTER AISLE EMERG. LIGHT INOP; FOUND BATTERY PACK #5, OVER AFT R/H SERVICE DOOR BAD. REMOVED AND REPLACED EMERG. LIGHT BATTERY PACK AT #5 POSITION PER REF. AMM 33-50-01. OPS CHECKS ARE GOOD.