I have done all the major work, etc. The car has 140k. Everything is running fine but now I been having some transmission problem, slippage. It is a auto tritronic. Service people recommended fluid kit and change. Any opinions?

when you stated "service people" I am assuming that you are dealing with a dealership? Where are you located? There are several reputable indy shops that many on this forum use, such as Brian's Garage, Greg's Repair, etc. etc.

Depending on where you are located, we can maybe steer you to a good shop.