I too have crd with bee's under bonnet had a good look under bonnet. It seems to be a vacumm line coming from turbo going to black module beside airbox maybe it is to do with variable turbo inlet, and is leaking down after the car is stopped. The amount of air pressure in the module would depend on what driving you have just done.
2003 Crd Graphite with ome,Cooper 255/70-16,Arb Bull bar ,60l aux fuel tank, IPF lights,counteract rust prevention,rola lugage rack,reverse sensor
David
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