As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE WORKING ON RIGHT ENGINE B LOOP MEL, FOUND CORE FIRE DETECTION HARNESS MW0325 FOR LOOP A DAMAGED AT 3 O`CLOCK POSITION RIGHT SIDE. GROUNDED - YES. REMOVED AND REPLACED MW0325 LOOP A REF B737-900 AMM 26-11-02. OPS CKS GOOD. PERFORMED ALTERNATE DEACTIVATION PROCEDURES ACCOMPLISHED PER MPM 05-07-01 TABLE 3 ITEM 1.