have 96 c280 heard crackling sound (short) from cabin light. pulled over and yanked corresponding fuse to no avail. remove dome light pulled 5 connectors seperately, discovered incabin temperature problem. but car will not start. mechanic claims rcl module #210b206226 replacement. Is this a DIY project and where can I get the parts? I have not replavce the in cabin sensor. Is this interconnected or can I go without for the time being. Thanks for your advice.