What was found
ON CLIMBOUT IN HEAVY RAIN AT 3000 FT, NR 1 ENG FIRE LIGHT ILLUMINATED. C/W EMERGENCY PROCEDURES. LANDED 23L. LIGHT STAYED ON AFTER LANDING. FIRE DEPT CONFIRMED VISUALLY AND INFRARED NO FIRE. TOWED IN. DISCONNECTED CONNECTOR D1909VC AT ENGINE NR 1 PYLON. PIN C AND U OF 11WD CTL UNIT CONNECTOR WENT COMPLETE OPEN. DISCONNECTED PINS A AND C FROM 27WD SENSING LOOP B NACELLE. FOUND THAT THE STUD IS BROKEN AND WHEN WIGGLED WOULD SHORT TO GROUND. NEED NEW NACELLE LOOP B. REPLACED NR 1 ENGINE LOOP B (27WD) IAW MM 26-12-12-4 UP TO STEP G (LOOP TEST). FOWARD CLAMP WAS FOUND LOOSE. REPOSITIONED CLAMP AND TIGHTENED. SUSPECT THAT CLAMP WAS LEAKING HOT AIR ONTO "A" FIRE LOOP. ACFT OK FOR SERVICE.