As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT FIRE WARNING FAILED TO TEST DURING PREFLIGHT CHECK. A 2 HOUR DELAY DUE TO LOCATION AND MOUNTING PROCEDURE UNIT IS NOT REPAIRABLE, COST OF NEW, $1,401.00. SUBMITTER SUGGESTION THAT DELAY COULD HAVE BEEN MINIMIZED IF NUTPLATES WERE USED FOR MOUNTING.