+1 with Shifty.
IMO, ECU,s dont just fail.
Have a browse on Disco3 site, some epic "faults" all caused by "mechanical" electrical problems, crushed wires, dirty connectors etc.
Ive been putting a paper together, for a work related project, on best practice for maintenance of electrical equipment, lots of really meaty stuff from US Navy/Air Force on how to fault find problems, rectify and prevent electrical problems. The US navy ones are good, try keeping a modern jet air worthy, when daily its getting drenched in salt water!
It really isnt rocket science and it doesnt cost a fortune. Believe it or not, cotton buds and tooth brushes feature a lot in their official guide notes!
Ill post up some links if anyones interested.
I suppose this thread did remind everyone what a bunch of muppets LR dealers are though, so I guess something good came of it!
Mark