What does the chart inside the fuse box lid say is served by fuse 7?

One of the other common culprits is the trunk light, when it's power wiring on the left trunk lid hinge gets worn through and starts shorting out on the frame of the trunk near the hinge. I don't know the 560's wiring though, so I can't say if that's something that would be applicable to your car.

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...