Tony, there's plenty ju-ju in the 4200
Having said that, there's also plenty of stuff that can be fixed without anything serious apart form proper investigation and some general tools.
My 4200 has been a bit unloved, but so far I've fixed:
Horns
A/C (those two were only fuses, granted)
Xenon self leveling system
Pollen filter
Wiper motor
Isolated three leaks in the boot.
Determined the fault on the reversing sensors
Fixed the mirrors inability to extend (another fuse)
It's all good, and a lot of thanks to those who have gone before. This is a fantastic resource, to which I try to contribute in my own small way
C