904 tranny leak

We pulled the pan on my trans this weekend to get a re-thread done. Changed the filter, new gasket, everything's tight. New bolt that needed help is snug. Leaking again!!! My buddy thinks we just need to re-tighten. Is that right or did we get it wrong??? I haven't jacked it back up for the exact leak location but it looks like the same place. Used a heli coil on the re-thread.