What was found
NR 1 ENGINE B FIRE DETECTOR LOOP WILL NOT TEST. ACFT GROUNDED. PERFORMED ENG/APU DETECTION CONTROL MODULE BITE IAW FIM 26-10, TK 801. FAULTED NR 1 ENG FAN UPPER LOOP B. IAW FIM 26-10, TK 805. LOOP B RESISTANCE IS TOO HIGH. FOUND TERMINAL LUG AT UP FAN OTBD BROKEN OFF WIRE. RETERMINATED LUG IAW SWPM 20-30-11 AND CLEANED LOOP B TERMINAL LUGS IAW CMM 26-11-01. IAW FIM 26-10 TK 805 RESISTANCE CHECKS GOOD. PERFORMED ENG FIRE DETEC OPS TEST IAW MM 26-11-00-710-801 AND APU FIRE DETECTION OPS TEST IAW MM 26-15-00-710-801. BOTH OPS TESTS ARE GOOD.