I have a synchro compur 0 that sitcks on B, the shutter opens but doesn't close on release. If I touch the lever then it closes. On all other speeds the shutter works just fine.
Any thoughts as to whether a CLA would sort this out, or if there's something I could try to get it going myself?
A CLA would indeed sort this out. It's not hard to clean Synchro-Compur shutters yourself, but if you don't feel confident about that sort of thing, it's not an expensive repair.