C5 wont start

I had another go last Sunday, the suspension started behaving itself, did the usual stand on the towbar test, correcter worked and the adjustment button as well. Came back 2hrs later back to where it was before so I'm thinking that I might start with the rear suspension and work forward. Oh, I forgot to mention that the suspension has been flat for about 18 months.
My Cit mechanic sold his business a few years ago and started a mobile mechanic business and as we are in lockdown he can't come to me and scan the system, so everything has come to a dead stop for now.
 
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