I have a very good condition (cosmetically at least! ) MB (Becker) Audio 30 APS. Have the GPS antenna, code and navigation disc etc.
It was (is!) a great unit as I'm sure you know - superb quality sound, proper pixel LCD screen etc. Circa £1k new back in the day!
One problem - it has a crackly output on one of the audio channels. I've been meaning to get it looked at by a Becker service place for ages
If you don't turn up any other units, you're welcome to see if it can be serviced at reasonable cost - I'm not looking for much really so maybe viable depending on how much to repair?