As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE DETECTOR WARNING SOUNDS INTERMITTENLY DURING FLIGHT. AFTER TROUBLESHOOTING, FOUND LOOP CHAFING IN TWO SPOTS. NO DAMAGE WAS OBSERVED ON LOOP. RESISTANCE CHECKED GOOD. LOOP WAS REPOSITIONED A SYS CHECK WAS COMPLETED IAW MM 26-10-40, PG 102. SYS CHECKED GOOD AND THE ACFT WAS RETURNED TO SERVICE.