As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TROUBLESHOOTING FOR EXCESSIVE INSULATION MATERIAL LOOSE IN THE TAIL CONE, THE TAIL CONE BLEED AIR OVERHEAT WARNING WAS FOUND INOPERATIVE. THE SYSTEM TESTED NORMAL IN THE COCKPIT, BUT WOULD NOT TRIGGER WHEN HEATED IAW THE MM. INSTALLED GROUND STRAPS PER RECOMMENDED SB 60-26-2. SYSTEM OPERATED NORMALLY. SUBMITTER STATES THIS BULLETIN NEEDS TO BE MANDATORY, OR AN AD.