I just purchased an 02 sc430 3 weeks ago. Love the car, but the top won't fully retract. Hit the button...all seems to go well, then stops before it dislodges from the front. Took it to the dealer, he had it for several hours. Everything tested ok, but he can't seem to figure why it won't unlatch from the front. He said he's worked for Lexus for many years and he's NEVER seen this with Lexus (Mercedes yes, Lexus no). Again, all diagnostics checked out fine. It just won't completely unlatch from the front. Help!!!