As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSG `L ENG FIRE LOOP 2`, TRIED REPLACING L ENG FIRE LOOP 2 CARD (M682), NO HELP. MSG WILL NOT CLEAR, HAD HARD FAULT. CHECKED RESISTANCE OF ALL FIRE DET, ALL CHECKED OK. THEN ACP HAND OVER HAND CHECK OF ALL FIRE DETECTOR LOOPS. ACP SEVERAL FIRE TESTS EACH TIME FIRE TEST OPERATED NORMALLY.