trans leaking again after rebuild

Hmm, I just put my 904 together yesterday, in 2.5hrs. I had already assembled, the clutch packs. Added new billet servos and accumulator. Only my second time. Installed today, works like a champ. I had to rebuild because I made the mistake of buying a used factory valvebody(too save some money) from a member here that had a trango stage 3 kit in it, low/reverse servo was partially engaging when it shouldn't and ate up my band and drum. This time I bought a turbo action full manual with low band apply.
Anyway, I would take it back to the shop if you think there are issues. If they told you converter was good, as well as their work on the trans then it's on them if you have issues.
I had a shop give me back my rebuilt 727 with converter installed and they told me its all good to go. I took it home, put it back in the car. It was pumping fluid out of the vent. Converter was hooped, they didn't even look at it, so they paid to pull trans and re-install, I paid for converter to be fixed. Owner was a very stand up guy,,,,now when anyone asked who to go to for transmission work I mention his name. Hard to find people like that these days.