Mellotronists

Dear fellow Mellotronists!

After reading Frank Samagaio's (IMHO brilliant) Mellotron book, I 
took my faithful #405 to our rehearsal room and kicked it back to 
life. After cleaning and some routine maintenance it sounds quite 
well again.
Now I'm looking for an improved motor controller, my CMC10 shows the 
usual problems (high frequency noise and pitch problems with six or 
more keys pressed).
Does anyone know where to get an improved controller like the SMS2, 5 
etc? There used to be an SMS5MR for sale at mellotron.com, which 
ain't there no more.
Are there schematics available (eg. in the M400 service manual) or 
has anybody out there one of these controllers for sale?

Thanks for any kind of information!

Season's greetings and kind regards

Reinhard
(M400# 405, MKII 104)