As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PASSENGERS DEPARTED ACFT SMOKE OBSERVED IN THE CABIN AT ROW 18A. CAPT TURNED OFF ALL ELECTRICAL POWER AND SMOKE DISSIPATED. CAPT CALLED FOR FIRE DEPT TO COME TO AIRCRAFT. MAINTENANCE FOUND THE LEFT SIDE OVERHEAD LIGHT BULB AND SOCKET MELTED AT ROW 18A. MAINTENANCE REPLACED THE LIGHT BULB, SOCKET, AND BALLAST FOR THE AFFECTED LIGHT.