EZL is super common on the CISE M104's. We have had two such cars in the last year, both had fragged EZL's. Went through the same diagnostics.. When there's nothing else left... When you Do get a new one be sure to renew the thermal paste!!

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta