Have you tried a forum search? The archive has a wealth of information.
Reading up on your problem will help you narrow it down to the possible causes.
Welcome, to take advantage of all the forum features, please re visit the 'Welcome to the Forum' tutorial sticky on top of the W126 page, as well as the two DIY stickies.
It will show how to search the forum (3 words min.), and has a link to the Russian MB site where you can run a VIN#.
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