As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD BANG , METALLIC PARTICLES AND WHITE SMOKE EXITED FROM EXHAUST. 1EA 2ND STAGE PT BLADE FOUND FRACTURED DUE TO THINNER AIRFOIL SECTION, 27 THOU, AT L/E. PT2 BLADE- CASTING ISSUE FIELD ACTION. IT IS PENDING SOME FIELD MFA SINCE THIS IS THE ONLY FAILURE OF ITS KIND TO DATE.