I agree and this is the real problem. Alot of work goes into keeping just this sort of thing quiet. I nearly purchased a GXP that had a bad HUD. It barely moved and the dealer said something like " the new ones don't go up and down as far as in your 96". They will say or hide anything to sell a car.
I stick to my original thought that the roof is not original to the car, especially after seeing the updated photo with the Solaire badge.
solaire does produce OEM roofs for GM
Maybe they do, but this particular roof looks after factory, of course, from what I can see from the photos. The switch is the key that makes me think this.
Or there is the possibility that the roof and mechanism are factory and it was just the switch that failed. I could easily see someone breaking off the switch do to the dual rocker/slider design. It took me a day to figure it out. I'm less inclined to think this the case, tho, after seeing the Solaire badge.
Does any other GXP owner with factory roof have the Solaire badge?