What was found
ON CLIMBOUT, THE LOWER AFT BODY OVERHEAT LIGHT ILLUMINATED. CHECK LIST WAS RUN. SOURCE OF OVERHEAT APPEARED TO BE NR 2 ENGINE INLET AND COWL ANTI-ICE SYSTEM. CHECKED ALL FIRE LOOPS, FOUND NO PROBLEMS. CLOSED UP AFT AIRSTAIRS, RAN BOTH PACKS TO HEAT UP AIR STAIR AREA DID NOT GET A LIGHT. FOUND THE BULB CONTACT WELDED TO SOCKET. REMOVED AND REPLACED BULB. NO PREVIOUS HISTORY OF WRITE UPS ON THIS PROBLEM.