Air Suspension - Preventative Maintenance?

[Dxthomas]

I seem to recall reading something months ago - detailing some of the components of the air suspension system which are advised to be replaced (before broken) - to help limit the failure of other more expensive elements.

Something like...replace the relay (and something else?) to avoid the compressor failing? I might have that all wrong though.

If anyone can help, or point me in the direction of any previous threads on this- then much appreciated.