As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THROUGH 6,500 MSL, FIRE DETECTOR LOOP OAP APPEARED FOLLOWED BY LEFT FIRE INDICATION. ALL INDICATIONS APPEARED NORMAL AND ENGINE WAS LEFT AT IDLE POWER PER THE QRH. NOTE ENG ANTI-ICE WAS ON. OPENED LT ENG COWL. FOUND DUCT JUST AFT OF ENG COWL ANTI-ICE VALVE WITH BROKEN COUPLING AND DUCT SEPARATED. REMOVED AND INSTALLED ANTI ICE DUCT NEED ENG RUN. RAN ENGINE. PERFORMED LEAK TEST ON NOSE COWL ANTI ICE DUCT NO LEAKS NOTED.