I HAVE PROBLEMS WITH MY 99 SLK 230. THE HARD TOP WORKS ON AND OFF...SOMETIMES ITS FINE AND DRIVE AROUND WITH THE TOP DOWN AND THE TOP GETS STUCK AND DOESNT GO UP. I HAVE TO MESS WITH THE SWITCH BACK AND FORTH. I HAVE TAKEN IT TO GET LOOKED AND HAS PASSED ALL THE DIAGNOSTIC TESTS AND ALL SWITCHES WORK. ANY ADVICE