As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE FIRE LOOP DOES NOT TEST FOR B. ACFT GROUNDED. MOVED LOOP SELECTOR SWITCH TO NORMAL. NR 1 ENG FIRE DETECTION OPS TEST NORMAL IAW AMM 26-11-00. ACCOMPLISHED ENGINE FIRE DETECTION LOOP RESISTANCE CHECK IAW AMM 26-11-00, TOTAL RESISTANCE VALUES ARE WELL WITHIN LIMITS.