Yea that's wat happened the ground wires were not tight so I think it fried the ptu but I got that replaced...I don't think they themselves know how to work on the car or are afraid of it and the service advisors say they have seen 1 or 2 in all their time working at nissan and not many know how to work on it blah blah but maybe like u said they don't want my service. I'm going to get it back and check fuel pressure,do the compression test and check the connectors I know a few are breaking off due to age so I might not be getting a good connection