What was found
AFTER TAKEOFF, A STRONG SMELL OF BURNING INSULATION AND WHITE SMOKE FLOWING FROM GLARESHIELD AREA. ACCOMPLISHED EMERGENCY CHECK LIST AND ISOLATED AC BUS NR 2 AND SMOKE DID NOT REOCCUR. RETURNED TO FIELD. MAINTENANCE INSPECTED AND FOUND THE LEFT RDS PANEL LIGHTING PLASTIC LENS MELTED. DEACTIVATED LIGHT AND PLACED ON MEL, REFERENCE MEL 33-1. THE MEL WAS CLEARED BY REPLACING THE DATA SELECTOR PANEL DUE TO INOPERATIVE BACK LIGHTING. COMPLIED WITH CAT 2 FUNCTIONAL TEST. NO DEFECTS NOTED.