What was found
(CAN) PILOT REPORTED THERE WAS NO NOTICEABLE RISE IN TEMPERATURE ON NR 1 ENGINE DURING ANTI-ICE SYSTEM ACTIVATION. INVESTIGATION FOUND LINE (P/N 6876333) HAD FAILED. THIS IS THE SECOND FAILURE OF THAT LINE IN 55 HOURS OF OPERATION. THE FAULT WAS FOUND TO BE EXCESSIVE VIBRATION OF THE COMPRESSOR. THE COMPRESSOR WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE. PART TC: 5,063.