What was found
PRIOR TO PUSHBACK FLIGHT ATTENDANT REPORTED AN ELECTRICAL BURNING ODOR AND PASSENGER CABIN LIGHTS INOPERATIVE ABOVE SEAT ROW 12 LT. MAINTENANCE FOUND SIDEWALL LIGHT BALLAST AT SEAT ROW 12 LT INOPERATIVE, DEACTIVATED AND SECURED BALLAST AND ISSUED MEL 33-2, C-1, CABIN LIGHT INOP. MAINTENANCE. REPLACED THE LIGHT BALLAST AT SEAT ROW 12 L/H, OPERATIONAL CHECK OF SIDEWALL LIGHTS AT LH SEAT ROW 12 WAS GOOD.