As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INBOUND CREW REPORTS SMOKE IN THE CABIN AT THE GATE. FOUND BALLAST INOPERATIVE AND BURNT AT SEAT ROW 11CDE. DEACTIVATED BALLAST AND SIDEWALL LIGHTS AND FORWARDED TO MEL. REMOVED AND REPLACED BALLAST PER AMM 33-20-07 PB401. SIDEWALL LIGHT OPERATIONALLY CHECKS NORMAL.