As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3739 THE CREW REPORTED THE EMERGENCY LIGHT WAS NOT A HOLDING CHARGE. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED AN OPERATIONAL TEST OF THE EMERGENCY POWER SUPPLY UNITS IAW CRJ-700 AMM 33-51-17. THE OPERATIONAL TESTS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.