As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TUBE HAD BROKEN AT WELDMENT THAT ATTACHES THE TUBE TO THE FLANGE THAT BOLTS IT TO THE ENGINE BLEED. AIR PORT WAS CRACKED 90% OF THE WAY AROUND WELD. THIS CAUSED THE ENGINE TO NOT REACH TARGET TORQUES UNLESS WATER METH WAS USED. UNIT WAS REPLACED AND ACFT RETURNED TO SERVICE.