What was found
MAINTENANCE CONTROL/TECH SERVICES REQUEST: FOLLOW UP TO HISTORY OF #1 ENGINE B FIRE LOOP FAULTING. GROUNDED - YES. COMPLIED WITH ALL TSR STEPS. (STEP 1) ACCOMPLISHED B737-900 FIM 26-10 TASK 805. UPPER FAN (M1757) = 5.88K, LWR FAN (M1758) = 3.84K, RT CORE (M1760) = 2.40K, LT CORE (M1759) = 2.97K. (STEP 2) ACCOMPLISHED CLEANING & GVI ALL DETECTORS & LUGS. FOUND UPPER FAN DETECTOR (LOOP B) WIRE RUBBING AGAINST THE DETECTOR HOUSING, INSULATION CUT & WIRE EXPOSED TO GROUND. (STEP 3) REPAIRED WIRE INSULATION REF STANDARD WIRE PRACTICE.