Hi Jerry,
Regarding your gearbox, I had the fluid changed about 5k ago. They had a few goes at getting it right. After the first change it wouldnt select gears properly so took it back and got talking to one of the mechanics and he said that what they needed to do was to change the fluid at least four times. They did this and it changes gear perfectly now. When I first bought this car with 90k on the clock I`d only had it about 2 weeks when it went into limp mode etc, took it back to dealer and they asked me to take it to a Jaguar specialist, they diagnosed a faulty turbo and replaced the turbo. As I only had the car for a couple of weeks the dealer picked up the bill. Until the recent egr valve replacement it has no more problems in the power department but has had a new belt tensioner £300 and brake vac pump £400. I only use premium fuel and Millers additive. As I live out in the countryside I dont do many short runs. I`m sure that makes a difference. Its a great car to drive and tow my 15 foot caravan with ease. Hope you get yours sorted.Cheers
Rod