Discovery 4 Air Suspension & Reduced Performance Faults (Blown Turbo?)

Land Rovers are great cars, but you need a spare £2000 a year for repairs if you want to run a used one out of warranty. Or maybe spend the cash on a warranty.
This is not a £30k car, it’s a £60k car with running costs to match.
The Ferrari of off-roaders is massively over-engineered for the school run, wests tyres, brakes and suspension arms like a champ.
Here I try to diagnose some issues with the truck…