What was found
#1 ENG OVERHEAT DETECTOR "A" INOP, FAULT LT ILLUMINATED. GROUNDED - YES. REMOVED ENGINE & APU FIRE DETECTION CONTROL MODUEL (M279). RESISTANCE CKS FOR A-LOOP PINS 24 & 25 D1002 SHOWS 70 OHMS. DURING SHAKE DOWN OF A-LOOP HARNESS, TERMINAL BROKE FROM UPPER FAN DETECTOR. TERMINATE NEW LUGS AT UPPER FAN DETECTOR A-LOOP. RESISTANCE STILL SHOW HIGH, TAPPING ON LEFT CORE DETECTOR AND SHAKING MW0325, RESISTANCE FLUCTUATES DOWN TO 2.9 OHMS. REINSTALLED M279. FIRE TEST NORMAL. CONDUCTED ENG/APU FIRE DETECTION BITE TEST WITH NO FAULTS FOUND.