As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: AFT CREW REST AREA- EMERGENCY LIGHTS FAILED 15 MIN CAPACITY CK--LIGHTS FAILED ALL AFTER APX 9MIN, ALL EMERGENCY LIGHTS IN CREW BUNK AREA SHUT OFF. MAINTENANCE REPLACED BATTERY PACK M33142 PER SSM 33-52-51.