Johnny -
I had the same problem w/ My 337 when I did the pre-purchase inspection...
When we did some hight altitude flying, we discovered (barely) that the induction tube on the back was just slightly loose, and it must have been leaking just enough to keep the engine from developing full boost above 11,000'.... When we would get to that altitude, the rear engine would suddenly get quiet...almost as if it had quit... It was still running, just not at the same power as the front...
We descended, and engine would develop full boost again..
It turned out to be a loose fitting... Since you have already sent your turbo out... its probably moot, but it sounded like you have already taken it apart/reassembled... I would assume you would have found any obvious issues/cracks, etc. etc..
Thankfully, mine was an easy fix...
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