What was found
(CAN) ON AUGUST 6/2007 SHORTLY AFTER TAKEOFF, MX HAD A REPORT FROM THE CREW OF A SMELL OF OIL IN THE CABIN. THIS WAS FOLLOWED BY A NR 2 ENGINE FIRE WARNING AND THE CREW PROCEEDED TO CARRY OUT THEIR SOP`S AND THE ENGINE WAS SHUT DOWN. THE ACFT PROCEEDED BACK TO YYT WHERE IT LANDED WITHOUT INCIDENT. THE ENGINE WAS REMOVED AND SENT FOR EVALUATION. IT WAS DETERMINED THAT 1 OF THE LOW PRESSURE TURBINE BLADES HAD FRACTURED AT THE BLADE ROOT. THE BLADES WERE SENT TO P&W FOR EVALUATION. IT WAS DETERMINED THAT 1 FRACTURED LPT BLADE AT .050 INCH FROM THE BLADE PLATFORM OCCURRED AS A RESULT OF FATIGUE ORIGINATING FROM THE TRAILING EDGE. DAMAGE TO THE REMAINING LPT BLADE AIRFOILS WAS CAUSED BY SUBSEQUENT MECHANICAL IMPACT FROM BLADE DEBRIS.