As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COCKPIT EMERGENCY LIGHTS WOULD NOT TEST. MECHANIC WENT TO GET NEW BATTERIES. UPON MECHANIC'S RETURN, THE CREW INFORMED HIM THAT THE LIGHTS WERE WORKING, BUT ONE BULB WAS OUT. WHEN MECHANIC WIGGLED THE BULB IT CAME ON. REPLACED THE BULB AS A PRECAUTION.