Here is what the shop owner just emailed me. I've been updating him all day with all the suggestions here.

"Yes I have the same dealer Mercedes scanner as the Mercedes dealer has. I checked out all this. I dont see any problem at this time its working perfectly fine. I have 6 month warranty on your gear shifter. I believe you can drive your car without any problem. please do call me or stop by to pick up your car. Thanks."

If I tell him to put a brand new shifter in the truck, not a used part like he did previously, would that most likely solve the problem? To say I'm irritated with his response is an understatement. I don't see why he would think the truck is ok and that it won't happen again.

__________________
1999 ML 430