Im sure this has been asked a million times but did a quick search and didn't find anything on here. I bought a 2000 Land Rover Discovery 2 a while back and got it home and my rear left side suspension is all the way down, yet the right side is up fine. I figured that'd mean it would be a airbag? However my compressor will not kick on anymore to even try and lift it. Do i need a new airbag and compressor? What does this usually run and is it possible to do myself or do i need to take it to a shop?