99 PA Ultra Transmission Question

I own a 99 PA Ultra with 208k miles on it. I bought it at 127k miles. The transmission has not been serviced since I've owned it and I don't know if anything was done before I bought it. I'm nervous about doing anything to the transmission for fear that it may mess up the "status quo". I've never had any issues with this. Just recently I've noticed a few hesitations when shifting, mostly when I'm on cruise control on the freeway. I've taken good care of all the other systems except for the tranny. :frown: I'm not sure how to proceed in this area. Input?

If the fluid is discolored or burnt,too late to help it. If it looks good just change fluid and filter, use Dexron V1.