As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT GATE, EVACUATED PASSENGERS AND CREW DUE TO SMOKE IN THE CABIN COMING FROM TWO CEILING LIGHT BALASTS AT ROW 3 AND 4 LEFT SIDE ARCHING. PULLED CIRCUIT BREAKERS S-1 AND S-2. REMOVED BULBS. PLACED ON MEL AND RELEASED AIRCRAFT. 9/23/04 MAINTENANCE REPLACED BALLAST RECEPTACLE.