As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT RETURNED TO YOW AFTER APPROX 30 MINUTES INTO FLIGHT DUE TO FIRE ALARM ON NR 2 ENGINE. ALARM WOULD NOT GO OFF AFTER NORMAL PROCEDURE SO ENGINE SHUTDOWN AND FIRE BOTTLE DISCHARGED. MX FOUND A 4 INCH HOLE IN THE 13TH STAGE BLEED AIR DUCT TO THE NOSE ANTI-ICE VALVE. DUCT WAS REPLACED AND ACFT RETURNED TO SERVICE.