Here's a video that shows you how to test your ETA.
Mercedes throttle actuator internals test. M119 motor 1995 SL500 - YouTube

There is a micro-switch on the gas pedal that affects the limp home mode. I have never replaced mine. Maybe I'll give that a shot if it shows up again this year. I already changed the Neutral Safety Switch.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles