As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR FLIGHT 3809 DURING PREFLIGHT INSPECTION THE CREW FOUND WHEN EMERGENCY LIGHTS SELECTED ON THEY WENT ON INITIALLY THEN DIMMMED AND THEN WENT OFF. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE EMERGENCY POWER SUPPLY BATTERY PACKS NR 1, 2, 3, AND 4 IAW CRJ 700 AMM 33-51-17. SERIAL NUMBERS: 110542, 104932, 104550 AND 109781. THE OPERATIONAL TEST OF THE EMERGENCY POWER SUPPLY BATTERY PACKS WAS SATISFACTORY PER CRJ 700 AMM 33-51-17-710-80. THE AIRCRAFT WAS RETURNED TO SERVICE.