NSM credit and control units for vinyl jukeboxes

Hi
I know its a long shot but does anyone know much about nsm credit and control units used in nsm vinyl jukeboxes from circa the mid seventies to the early eighties. Specifically has anyone attempted repair of these units, where replacement ic's can be got for them , has anyone done any troubleshooting on them and anyone information on the rom/eprom chip in them. Information in nsm manuals is non existent on these units and I have never been able to find any examples where someone has repaired these
clones

Hi Clones,
Didj check the above "announcement posts" ?? --there is at least one NSM contact, listed there !
Ron Rich

Hi
Yes seen that Ron, thanks, was just wondering had any of the forum users any experiences of repairing the units themselves. Information on these is almost as rare as info on Rockola profit setters and Wurlitzer credit units from the German made Wurlitzers of the late seventies-early eighties. I suppose the work on these gets more specialised because of the use of programmed chips and the need for oscilloscopes. There is some info on the wurlitzers on the jbw-jukebox forum
clones