As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PARAMETER SHIFT DETECTED BY ENGINE CONDITION MONITORING SUSPECT HPT 2ND BLADE SULFIDATION. REPLACED ENGINE. SHOP TEARDOWN DISCLOSED ONE STAGE-2 HP TURBINE (HPT) BLADE FRACTURED JUST BELOW THE MID-SPAN. FRACTURE WAS THE RESULT OF INTERNAL COOLING AIR PASSAGE SULFIDATION. THE SULFIDATION ARISES AS A RESULT OF CONTAMINATION FROM TURBO TIP COATING APPLIED AT BLADE REPAIR. PRATT & WHITNEY HAS REVISED THE REPAIR PROCEDURES TO PREVENT CONTAMINATION OF THE INTERNAL COOLING PASSAGES.