What was found
(CAN) THE CLIMB THE NR 1 ENGINE LET OUT A SHUDDER AND THE ITT ROSE TO 950 DEGREE C FROM APPROXIMATELY 840 DEGREES C. THE CREW LEVELED OFF AND ALL APPEARED NORMAL OTHER THAN THE ITT WAS ABOUT 100 DEGREES HIGHER THAN THE NR 2 AT CRUISE POWER. THE CREW ATTEMPTED TO SET CLIMB POWER AGAIN AND THE ITT ROSE QUICKLY INTO THE RED AND GOT A LT ITT EXCEED B STATUS MESSAGE WHICH REQUIRES AN AUTOMATIC BOROSCOPE INSPECTION. ACFT RETURNED TO DEPARTURE AIRPORT. AS VIEWED THROUGH COMPRESSOR INSPECTION. PORT S8, IT WAS FOUND THAT THE NR 4 IGV STATOR INNER SHROUD SEGMENT, REF IPC 72-32-00, FIG 1, ITEM 15 HAS FAILED AND SHIFTED. THIS ALLOWED THE SHROUD AND IGVS TO CONTACT THE NR 4 AND NR 5 COMPRESSOR ROTORS, CAUSING SIGNIFICANT PHYSICAL DAMAGE FROM STAGE NR 4 THROUGH STAGE NR 10 OF THE COMPRESSOR. ENGINE REPLACEMENT IS REQUIRED.