My light bulb for the clock is out in my R129 and the dealer said in order to change the bulb, the entire dash will have to come off. Is that really necessary. The cost for that is approximately $100. I am wondering if I can change the bulb myself and save some money? I don't want to take the dash apart and find out I cannot put it back together. If this can be done over the weekend, is there something I should be awared of before getting started? Any help will be greatly appreciated.