As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE MW0326 FOUND DAMAGED DURING ENGINE HARNESS INSPECTION. GROUNDED - YES. REMOVED AND REPLACED NR 1 ENGINE CORE FIRE DETECTION HARNESS MW0326, IAW B737-900 AMM 26-11-02-000/400-802. C/W ENGINE FIRE DETECTION OPS TEST, IAW AMM 26-11-00-710-801. NO DEFECTS TO NOTE. ALL CHECKS GOOD. GROUND VERIFICATION TESTS SUCCESSFUL.