As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT HAD A AMBER "#1 FIRE DET" ON EDU. AFTER TROUBLESHOOTING THE ISSUE FOUND THAT THE #1 FIRE DETECTOR IT SELF FAIL THE CHECKS PERSCRIBED VIA MAINTENANCE MANUAL. PROCEEDED TO CHANGE OUT #1 FIRE DETECTOR AS REQUIRED. WITH AN OPS CHECK THAT WAS GOOD.