As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SMOKE IN CABIN COMING FROM BUFFET CEILING. OVERHEAD PANELS REMOVED AND MAINTENANCE FOUND INOPERATIVE LIGHTS AT SEAT ROW 7. TWO BALLASTS WERE FOUND FAULTY. BOTH UNITS WERE AT MOD 'D' STATUS. MOD 'G' INTRODUCED DESIGN CHANGES TO PREVENT THESE OCCURRENCES.