Ok this one has me stuck.
I can get the trim to function on the release but there is 3 shifts up (these are 10spd) with no trim shift down.
Has anyone an idea on what the issue could be, it’s got me puzzled

I think Dura Ace 10 speed only had trim function in 1 direction.

Cheers, why would there be a trim function from small to big ring, am I being stupid as this is what happens to mine

I think Dura Ace 10 speed only had trim function in 1 direction

Me too.

Which direction?

There is/was a click worth of trim on the small ring, so when you get towardsgears 8 and 9 the chain won’t rub on the front mech.Search me why they didn’t put any trim on the big ring. Weight saving I spose.

cheers