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

I purchased transmission and convertor from a person in the business, and its got 4 neutrals and leaking like a sieve. Less than excited to return it for more problems

I am near Sioux Falls,SD 57107 ..
I read through this whole thread something doesnt ad up, 4 neutrals?
is there any chance the converter wasnt seated properly and during installation the lugs were broken off the pump gear?
not hard to figure out who the builder was after reading the post. he has a great reputation, been business a very long time and I am sure stands by his work.
why the hesitancy to allow him to make it right?