I had some codes and odd behavior that led me to a faulty shifter module. I started hunting around for replacement options. It seemed like there weren't many.

Research led me to a guy called Ivan (ipaykov@gmail.com) who has a company in Europe. They do remanufacturing of electronics primarily for Mercedes, and they offer 12 months warranty. If you need I'd highly recommend him. Communication was excellent and the part was to me in 2 days (USA/NY). 4 days after my diagnosis I was back in the game.