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You may want to just built a LED test tool [ $10] an go get the codes yourself.

Here's the codes for each module . Your chassis has the 38 pin Diagnostic plug. [ OBD1]

http://www.geocities.com/MotorCity/Downs/1039/mercedes/cs1000_mb.pdf


..and here is the tool.

http://www.peachparts.com/shopforum/showthread.php?t=107630

These are only Flash Codes ,but it will give you a direction.
Post results.

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A Dalton