As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 3747, ALL EMERGENCY LIGHT BATTERY PACKS FAILED CAPACITY CHECK, DID NOT ILLUMINATE EMERGENCY LIGHTS AND SIGNS FOR 15 MINUTES. CORRECTIVE ACTION: REPLACED 9EA EMERGENCY LIGHT BATTERY PACKS AND PERFORMED A SATISFACTORY OPS CHECK. (LP 0834157)