njoroge
In the past, SEW Eurodrive has recommended replacement dc drives from EuroTherm (the 514C/08 as a replacement for the moviret 108). These are still available from some online suppliers although Eurotherm has some newer generations of dc drives as well.
Also, if you have a moviret already that just isn't working, SEW Eurodrive still repairs these, although movirets now have to go overseas so it takes some time.