Unless you have a scanner that scans the non-emissions related components (i.e one set up specially for Mercedes) it wont be checking error codes on anything except the transmission/engine-mananagement.
So, really, it needs to be put on Star Diagnosis (which is an answer I hate giving!)
There is a recall on the S class (and I presume the CL) cluster for around 2002 which causes the backlight to fail, so maybee you should remind them of that to see if they will do at a sensible (or free!) price
Cheers
Richard
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