As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT WAS CLIMBING OUT WHEN THE CREW REQUESTED TO STOP THE CLIMB AT 12000 FT, DECLARED EMERGENCY REPORTING AN ENGINE PROBLEM AND STATING THEY WANTED TO ENTER A HOLD TO WORK THE APPROPRIATE CHECKLISTS, RETURNED TO DEPARTURE. IT WAS A STAGE 2 HPT BLADE UNDER-PLATFORM CORROSION ISSUE. KNOWN ISSUE. THE SB WAS RECENTLY UPGRADED FROM CAT 7 TO CAT 3.