As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MULTIPLE EMERGENCY LIGHTS OUT. AFTER TESTING, FOUND EMERGENCY, BATTERY PACK NR 4 TO BE UNSERVICABLE, REMOVED EMERERGENCY BATTERY PACK NR 4 IAW AMM 33-51-17-000-801-A01. INSTALLED SERVICEABLE EMERGENCY BATTERY PACK NR 4 IAW AMM 33-51-17-400-801-A01. OPS TEST GOOD ALL EMERGENCY LIGHTS NOW WORKING GOOD.