As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE FIRE SWITCH DOES NOT ILLUMINATE WHEN OVERHEAT/FIRE POSITION IS SELECTED WITH THE TEST SWITCH. GROUNDED - YES. REMOVED & REPLACED FIRE DETECTION HARNESS, MW0326, REF AMM 26-11-02-400-802. ACCOMPLISHED ENGINE FIRE DETECTION OPERATIONAL TEST REF AMM 26-11-00-710-801. OPS CK GOOD. GROUND VERIFICATION SUCCESSFUL.