Anyone local to me capable of correcting errors on a 904 race build

I'm not doubting that the transmission has issues but this sounds like a witch hunt. Why not use the shop that's been in business 40+ years that you trust for the transmission in the first place? The transmission was purchased before Cope quit building them. When was that? Over a year ago? I'm not sure when he quit building but seems like it was over a year ago. From the builders stand point a lot can happen in that time frame. You've stated he told you to calm down then hung up only to turn around and say he said send it back and then hung up. There's more to this.