I have related questions on tranny fluids. I'm a "car guy" but never worked on a DSM before. Buddy's wife's '99 Eclipse (420A) had a tranny flush at Jiffyboobs about 35000 miles ago, car has 60000 miles now. I confirmed they use only Dexron crap.
Should I go ahead and swap out the fluid, or are there any risks with that? Tranny has had no problems.
I've done searches that refer to a +4 fluid...I'll pick up either +3 or +4, whatever is available. Does the brand matter? That looks like Aamco in the pic. Valvoline also makes a +3.

I will vacuum out the pan from the dipstick hole, refill with the new stuff, and then drain the return line while adding fluid to the dipstick port. Any tips or suggestions?

Thanks a lot for your help.