Next time you buy plugs, opt for the Volvo brand, they usually get over 50K miles and are more reliable. And, yes, plugs can be defective.
As for the AMM and O2 sensor, lots of luck getting some money back!
All compression readings must be done on a warm engine. For NA engines, 185-213psi. Turbo compression, 156-185. All cylinders should be within 10% of each other. So I do not under stand your readings of 120 and 135, those are much too low.
Do a search for replacing the PCV system, it has been posted multiple times.
Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.
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