What was found
#1 ENGINE "B" LOOP FIRE TEST FAULT GROUNDED - YES. ACCOMPLISHED ENGINE/APU FIRE DETECTION CONTROL MODULE BITE REF B737-800 FIM 26-10 TASK 801. FAULT SHOWS DETECTOR WIRING OPEN. FOUND BROKEN TERMINAL LUG ON THE UPPER FAN DETECTOR ASSY. RETERMINATED REF B737 SWPM 20-30-11. RETURNED THE MODE SELECTOR SWITCH TO NORMAL POSITION. OP CK GOOD REF B737-800 AMM M26-15-01-400-801. GROUND VERIFICATION SUCCESSFUL.