As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3728 THE CREW REPORTED THAT THE EMERGENCY LIGHTS WERE INOPERABLE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE EMERGENCY POWER SUPPLY UNIT BATTERY PACKS 1, 2, 3 AND 4 IAW CRJ AMM 33-51-17. SERIAL NUMBERS OF THE BATTERIES ARE: 80165, 104960, 77291, 10493A. THE OPERATIONAL TEST WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.