Duchess slowly drops to her bump stops over about 5 days, sprayed everything with soapy water and can't see a leak anywhere, car was put into off road height whilst I did this. No air leaking from the exhaust silencer either, however when I disconnected the nylon pipe 8mm? Nearest the front of the valve block there was a lot of air released so I guess that's from the receiver? The 4 from the air bags, which I disconnected first had just a little puff left in them. Anyway, got a lazy day today and another pressure switch so fitted that and installed this unknown valve block to test it. Door open and it took 11 mins to fill the system which means a good compressor? It's very quiet running too. Shut the door and up she went.
So looks like a guddon.
Had a measure of arch heights and I'll see if it still drops over the next few days.
 

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