What was found
CREW REPORTED BEFORE PUSHBACK PASSENGER IN SEAT 1A NOTICED SMOKE COMING FROM THE UPPER CABIN LIGHTING DIRECTLY OVER SEAT 1A. IND MECHANIC INSPECTED DISCONNECTED SHORTED LIGHT ASSY AND REMOVED BULB AND PLACARD 1A LATERAL LIGHT ON TO PLACARD 009968 MEL 33-20-00. ON 03/21/2001 BDL MAINTENANCE REMOVED AND REPLACED LATERAL LIGHT SOCKET OVERHEAD OF SEAT 1A AND REPLACED BULB. OPS CHECKED GOOD IAW EMB145 MM 33-21-00, PLACARD REMOVED. AIRCRAFT RETURNED TO SERVICE.