I am having a very similar problem, but with a D5 engine. Foaming bubbles in the coolant. Pressurization of the coolant, but goes back when the lid removed. I thought it was a head gasket issue, but local garage says they just had 5 Volvos in a row with failed EGR cooler. This made sense, so I replaced it (£200) and so far all good.
Worth a try compared to head gasket.
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