As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L ENG FIRE LP1 STATUS MSG. MEASURED RESISTANCE FROM M681 FIRE LOOP 1 DETECT CARD THROUGH PINS 19 AND 20 1.5K OHMS RESISTANCE CHECK GOOD IAW B767 SSM 26-11-01 REMOVED AND REPLACED M681 FIRE DETECT CARD IAW B767 AMM 26-11-01 OPS CHECK GOOD CLEANED UPPER AND LOWER AFT FIRE DETECT ELEMENTS IAW AMM 26-11-02 AIRCRAFT NO ETOPS. A/C RETURNED TO SERVICE.