As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 FIRE DETECTOR CIRCUIT LIGHT ILLUMINATED IN-FLIGHT. THE FIRE WARNING TEST WAS INITIATED AND TESTED SUCCESSFULLY. ENGINE INSTRUMENTS APPEARED NORMAL. FOUND ONE CLAMP INSULATOR OUT OF POSITION. REPOSITIONED INSULATOR AND LOOP. LIGHT EXTINGUISHED WITH COWLING SECURED. FIRE WARNING CKS GOOD.