As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT TRANSIT FOUND CEILING EMERGENCY EXIT SIGN AFT OF SECOND OVERHEAD LIFERAFT INOPERATIVE. TROUBLE SHOT SYSTEM. REMOVED AND REPLACED BATTERY PACK POWER PACK ASSEMBLY. OPERATIONAL CHECK OK, IAW MM. AIRCRAFT RETURNED TO SERVICE.