As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER ARRIVAL OF THE ACFT AT THE GATE, A HAZE AND ELECTRICAL SMOKE WAS OBSERVED BY THE CREW AND PASSENGERS AHEAD OF THE MID GALLEY. MAINTENANCE HAD MET THE FLIGHT AND WERE ABLE TO ISOLATE THE CAUSE TO AN ELECTRICAL BALLAST LOCATED ABOVE SEAT 5A. THE BALLAST WAS REPLACED AND TESTED SERVICE IAW AMM 33-21-00-962-124 .