Thanks. The reset I was referring to is this....

Reset Transmission Adaptive Shifting - How to Programming Instructions DIY - MB Medic

Not a flash or anything crazy. I think.

It's got around 89K kms. I just got it recently and have no idea if there has ever been a transmission service or fluid change/flush, but the Carproof I ran showed a Chrysler major service in 2010, at around 67K kms, so I imagine it(or something...) was done. Either way, doesn't hurt to just go ahead and do a fluid & filter change, as I'm sure everyone would agree with. I still think it's a valve body issue, but I'll see what a professional has to say. I'm going to go and look under it later and see if I can see anything travelling up the connector wires to indicate if there is a leak there. At least I could point at something and say "aha!".