Dammit, I did reply but lost it

Ok 2nd try but in summary

I'm planning to do a maintenance service and change the fluids (oil and auto trans) and replace filters (oil, trans, fuel, air) so will progress with that. I'm no expert on car mechanics but have done all the maintenance post warranty end maintained it that way with it going to a mechanic if I notice any issues I can't solve or look to be a bigger issue than I can do. I think I have left the auto trans fluid this time way too long which does not help. Auto seems to work fine, drops down gear ok but not great as the car is very sluggish so slow to respond, hence we manually drop it to 2nd when needed.

Our location has some very steep hills that even our 5 year old Mazda struggles in high gear, plus being windy the Troll has little time to speed up for an oncoming hill.