Wow....this post of yours has gotten by me. Didn't see it till today.....hmmmm, got to check my reading skills. I guess it doesn't matter, I am not much help here anyway. No, I dont know of any shops I would recommend. I usually do my own work. Are you sure its the rear main and not leaking from above?
Of course me, I would get a book and try to see if I could do it myself, but thats based on how much time you have.