I have a cascading set of events but the odd 2187 that I've been having has become much clearer.

The engine is making an odd noise some say it whines, I'd call it more of a bird chirping.

Remove oil filler cap and it stops.
Remove di[ stick and it stops.

I have excess pressure in there and it is probably the PCV box. I called Volvo USA and I am covered under the extended warranty #205.

Now the problem is to get the dealer to diagnose it, pay for it, etc. I am sure they are loathe to do the work because they probably don't get paid all that much to do the work. I already had the service guy tell me I am wrong.