First try a battery disconnection procedure to see if that clear any soft or hard faults (see wiki)
If that doesn't work then you will need a diagnostic tool that can read LR air suspension codes (e.g. IID Tool) in order to read the faults and clear them.
You can do a visual check under the car to look at the height sensors and wiring, and also for any visible holes in the air bags.
Most likely suspects - in this order:
Height sensors
Air bags
Compressor
Reservoir
Valve Blocks & piping
ECU .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962
Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999
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