[folivier]

Bill, glad you were able to safely get it changed out. Question: do the new turbo blades look like the old one? IOW do the blades have the same split you mentioned above? Also looking at your picture again the center nut appears to have some damage.
Just trying to think this through, as I mentioned above the mechanic who changed mine listened to the sound of the turbo and determined it was bad. My hearing is not great and I couldn't detect any difference in sound but from other symptoms was sure my turbo was going out. My blades were good but the bearings were going bad.
Were you able to find the pieces and remove them?