Hey their cintra07,
Sorry to hear about your problem. I am not much for mechanical problems but will try to help you as much as I can, and we have some good mechanically inclined guys here who I am sure will chime in later on today. Just in case, their are also some very good Tech People over at the following Link you where you may also want to post this problem to as well. First here is the Link.
PTCrew.com - Learn it or Burn it.
Next, your Code is:
P0700 Transmission Control System Malfunction
My guess is more of an electrical issue, but the Transmissions in PT's are known to be on the weaker side of things. It sounds like something might be binding up. If the Trans was blown, iat least from my experience it was going into gear, but was making horrable grinding noises, and after servicing the trans, it had a ton of metal shavings in the bottom which is a tell tale sign its shot, and even at that, I still drove it for 9 more months every day till it finally woudn't go into gear anymore. My best immediate advice would probably be to go ahead and do the flush, and service to the trans to start. See if the pan has shavings, and go from their.
I will keep on looking and see if I can find anything more, and like I say, hopefully someone else will come along here shortly and may be able to help out better than I can.
Go easy, and I will check into it.
Candyman