all the lights have come on onmy suspension button and the computer says eas fault. the suspension still levels itself out when the car is started what can it be?

You have a fault that has been logged in the EAS computer. Sounds like you have not thrown a full fault because the car is not on the bump stops but you are just a few hours of operation away from a full fault. nine times out of ten you have a slow leak somewhere in the system either from worn out bags or a leaky o-ring. This slow leaks causes the compressor to run more or less continously and overwork the system.

I have some good videos and products for working with, clearing and diagnosing the EAS fault at Range Rover EAS Reset Tools