As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT RETURNED FROM FLIGHT TO ARCTIC. ALL DE-ICE BOOTS ON AIRCRAFT WERE FOUND SPLIT ALONG CHORD AND HAD TO BE REPLACED. THE PRESSURE REGULATOR WAS TESTED AND FOUND TO BE FUNCTIONING NORMAL. WE WERE UNABLE TO DETERMINE THE CAUSE OF THE FAILURE. THE PILOT REPORTED IT WAS COLD AT ALTITUDE AND NOT SURE IF THE BOOTS WERE ACTIVATED. (TC NR 20061214003)