As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR - FLT 0429 - DURING FLIGHT AT APPROXIMATELY 17,000 FEET, CREW DETECTED FIRE/SMOKE FROM BEHIND FLIGHT ENGINEER'S PANEL. REPLACED LIGHT BALLAST. INSPECTED SURROUNDING STRUCTURES AND WIRING. NO DAMAGE NOTED. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)