Uneven ride height on the vehicle can be caused by leaking air springs.
Car Problem Reports
Land Rover Discovery Leaking Air Springs May Cause Uneven Ride Height
Land Rover Discovery Problem
Average Mileage: 101,500 mi (101,000 mi - 102,000 mi)
Visitor, 2001 Land Rover Discovery, 102,000 mi
Air bag on passenger side failed after wearing out. Ordered new replacement air bags & replaced them. Quite easy actually... Followed online directions & ordered new air bags off of ebay.
Visitor, 2001 Land Rover Discovery, 101,000 mi
Replaced rear airsprings with bilstein aftermarket parts, saved a bunch.