What was found
(CAN) AFTER ENGINE SPLIT, ENGINE SUFFERED A CT BLADE FAILURE. 1 CT BLADE HAD LOST APPROX HALF OF ITS AIRFOIL, & OTHER BLADES HAD MATERIAL MISSING MOSTLY IN THE AIRFOIL UPPER PORTION APPARENTLY AS A RESULT OF IMPACT DAMAGE. MATERIAL FROM CT BLADES ALSO DAMAGED HOT SECTION DOWNSTREAM OF CT VANE. GG CASE DIFFUSER DUCTS HAD UNUSUAL & UNIFORM CRACKING DAMAGE. FRACTURE OF BLADE AT MID SPAN IS SUGGESTIVE OF A FATIGUE FAILURE DUE TO BLADE VIBRATION. CT BLADES WERE INSPECTED AT THE LAST O/H IAW O/H MANUAL. 12 BLADES FOUND TO HAVE UNACCEPTABLE COATING LOSS & REPLACED NEW & BALANCE OF SET INSPECTED AS SERVICEABLE & WERE RE-INSTALLED. THE CT BLADE FAILURE INVESTIGATION.