Can anyone offer any assistance? My boyfriend's conv. hardtop gets stuck on his 2006 Cadillac XLRV, sometimes up, sometimes down..and sometimes in between. He has taken it in to the dealer several times, some parts have been replaced. But they usually tell him they cannot duplicate the problem. He is quite frustrated, so now it is time for the research queen to see if I can find some answers. Make me a hero, thanks!