The PCV valve was always a culprit for breaking down, due to the hot oil vapour running through it. I have assumed mine is OK for ages, and it has dropped off the radar a bit when 'sludge' was the thing to worry about. Now it is a non issue and the PCV is all but forgotten these days. I'm checking tomorrow first thing! A cheap fix though and it keeps things running 'proper'.
Can the solenoid be bypassed easily, still not sure how to sort that one out for my Linear.