Can anyone advise me how to remove and change the bulb from our interior lights in our 2004 Dethleffs Globetrotter Motorhome please. I can't open them and don't want to break anything.They are black rectangular fittings with a small round rocker switch. P.S. I don't know how to insert an image on your site. Please SHOW ME THE LIGHT ! Denny Reality is an illusion brought on by a lack of alchohol !