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Not sure how to test, lifting the oil filler cap to see if there is a vacuum but then the lack of vacuum would cover a split pipe as in the video.
https://youtu.be/kp8il0uq4SA?si=BCGlUTl1LPLwf767
If you can take off the four bolts on the cover and look if there is oil residue that maybe the issue in the pcv valve. -
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Would have done it for £20 ;)
Shitbox means you do the work in the UK anyway.