So after clearing the CEL about 2 more times after I replaced the valve cover, it looks like the fault code is staying away (for now). Very strange that it didn't clear right away but I was able to run over and pass my emissions test without issue and I've put a few hundred miles on the car since then without the CEL coming back.I had mine checked out at the dealer after reading several threads all with different results of what was causing the issue thinking I could save money not having to get the cover or anything else. sucked having to pay the fee for diagnosis but it just end up having some ground terminals cleaned which is what someone else had done before as well. Been good ever since. I don't know which ones they were but maybe it'll be enough to point you in the right direction since you think it could be electrical.
There's a grounding point on the back of the valve cover that looked ok to me but made sure it was nice and tight after I replaced it. After looking over the wiring diagram I don't think that ground has much to do with the actual PCV or emissions system but I am also not an expert at car electrical stuff so I could be missing something. Sounds like from your visit to the dealer that it would be good to look over the main grounding points in the engine bay to see if there's any other spots that could become an issue.