What was found
ON FLIGHT 3808 THE CREW REPORTED THE EMERGENCY LIGHTS WERE INOPERABLE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE EMERGENCY POWER SUPPLY UNITS 1, 2, 3, 4 IAW CRJ-700 AMM 33-51-17. SERIAL NUMBERS: 68205, 104837, 103166, AND 104935. PERFORMED OPERATIONAL TEST OF THE EPSUS 1, 2, 3, 4 IAW CRJ-700 AMM 33-51-17. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.