Has anyone rebuilt the original backup cameras ? Can you clean, seal and regas the camera module ?
If you have the Javelina camera, it is a sealed box system and nitrogen filled. After removing it from the coach, I found no way to repair it and they are very expensive to replace with original equipment. There are a number of really nice after market cameras, some including 7" LCD monitors for considerably less money. Search the archives for backup camera posts. You should find a lot of information.
You might want to get a new camera. You can get color and better resolution for not a lot of money at RV Cams.com. They are in Louisiana and have helped a number of forum members.
Brett Wolfe has or had this for sale:
http://www.foreforums.com/index.php?topic=9869.0 (http://www.foreforums.com/index.php?topic=9869.0)
He is very knowledgeable about changing to an OEM look monitor also