Called my dealer (Bob Johnson- Rochester, NY) a couple of weeks ago and told the service mgr. about my charge port door sensor and how it reads open (on the main display) even though the door is closed (sometimes) and the repair was for a replacement (thanks to these forums!). He said "absolutely no problem Mr. Miller, I will take care of this for you and we're sorry to hear you had a problem with your 2012 Volt". He called back today and said the new door was now in, so I made my appointment for tonight after I close my store (yes, the service dept is open till 8pm!).
I also have a very slow leak in the RR tire. I lose only ~2lbs a week. They are going to look at that also.
VERY HAPPY w my 50-mile-away-from-me dealer so far, I got $2,000 off MSRP back in Sept. and I guess it was still worth the savings for the drive(s). I'll report back tomorrow with my "should be easy to fix" results.