As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CVG - FLT 3971 - EMERGENCY LIGHTING CIRCUIT BREAKER POPPED. REPLACED CIRCUIT BREAKER 8500 AND RELAY K0275. OPERATIONAL CHECK OF EMERGENCY LIGHTING SYSTEM GOOD PER EMB AMM 33-50-00. AIRCRAFT RETURNED TO SERVICE. C/B PN IS REBC4105-200003. (M)