I could sure use the exploded view as well.Welcome to the forum! Sorry that you joined due to a major issue.
If you want to PM me your e-mail address, I can send you an exploded view of the cylinder head from the factory service manual. This shows both of the cam shaft position sensors, exhaust and intake, as well as both of the variable valve timing solenoid valves. Could be that it is one of these solenoid valves that is causing your problem. Of course, this is just a guess on my part. Seeing all of the parts involved, my help you better understand what the shops are telling you about the work involved.