When I had my P0442 code on my 2002XC, I replaced the gas cap with a new OEM cap and the code went away. I paid thru the nose for it ($32?) but I was worried that if I went with one of the cheaper replacement brands and I still got the code, I'd be wondering if the problem was somewhere else or was it because I went with a cheaper off-brand cap and it wasn't giving me a good enough seal.
Don't know if you went with a new OEM gas cap. Maybe just something to keep in mind as you check the other EVAP components. Maybe others can give their experiences using the non-OEM caps. good luck, hope you get it sorted out!
2007 XC70, 206,000 miles
2002 V70XC, 130,000 miles, parts car
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