These transmission shops a lot of times will not tell you the truth that is my findings here in my town for sure. That is why places like LVC are so good to help people from possibly wasting their money on a useless repair when you could have done something for less than 1/4 of the cost. These solenoid packs do not always throw codes either I know mine didn't but changing all that fixed my issue and did not need a rebuild. I mean to me the first step is to always drop the pan and look for metal. Because usually if something went terribly wrong in these things you will see lot's of metal or at least some chunks. If no metal change the valve body/solenoid pack and fill her back up with the correct fluid for your year car, throw a new filter in and a new pan gasket and most likely it will fix your issues. The hardest part of it all is the solenoid cable that one bolt is a pain to do at the end.