As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) APU HAD HIGH ITT ON START, HIGH ITT WHEN AIR CONDITIONING PACK AIR DEMAND APPLIED AND APU AUTO SHUTDOWN. REMOVED APU AND FOUND THE COMPRESSOR DISCHARGE SENSE LINE, PN 3884967-1 TO THE VARIABLE GUIDE VANE ACTUATOR, PN 126842-2-1, BROKEN AT THE B-NUT FLAIR.