Neil, Three reasons it didn't show up before:
1 - So many error codes it got lost in the clutter. That's why I needed to replace the harness, etc.
2 - My tech brought in a consultant to review the problem - a guy named Marty from Luxury Motor Vehicle Information Systems (LMV Info). Marty put a different diagnostic unit on it. Marty's unit was laptop PC based. It could read more inputs live than the error memory stored, so the generalized error codes could be broken down into specifics.
3 - The shift selector error only showed up as a live error, while the car was running.

This, of course, is as I understand it as a layman.

And Michael, yes, I knock the burl every time I start it!

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Mark Stetson
1995 E320 Wagon Moonstone Grey/Parchment 106K mi.
2007 E63 AMG Graphite/designo 75K mi