Bought this off a buddy last Spring w only 750 miles on it. He had reverse problems several years ago, but was supposed to be fixed by dealer. As you can tell from mileage it has sat a lot. Finally getting some snow here in Fairbanks & I can't reverse to do a damn thing. Only thing I know to check is fuse & it's good. Dealer keeps telling me it needs to be shimmed somewhere to work, but not having any luck finding where this shimming needs to take place & really don't want to pay them an hours shop time for something that sounds pretty simple. Anybody know where & how this little sensor is what is spec? Thanks!