I just picked up my Trailblazer from having it's transmission rebuilt. The service engine light was still on when I got there. The "assistant" checked for codes and got PO756. He reset the computer, told me to go ahead and drive it, and see if the light comes back on again as he is only the assistant. They are closed over the weekend and call Monday to talk to the tech that did the rebuild as there was no breakdown in actual parts on the bill. My tranny was slipping BAD and had lost reverse and it seems to be shifting fine but the shop is only 5 miles away and I haven't drivin it any further than that. I need to know how "easy" of a fix it is and a time frame to do it just in case. I've already been without my vehicle for the last 5 days! :( You would think they would have checked it and replaced it and reset the computer before finishing the job. This shop has good reviews. That's why I took it there. Thank You!!