Proteco Aster 3 ram fault

[soother]

This ram was buzzing and not moving, and replacing the capacitor made no difference.  There is continuity from the grey common wire to the brown, but no continuity from grey to black. Pushing and bending the travelling cable makes no difference, so my diagnosis is an open circuit motor winding.

This job is a favour for an elderly lady neighbour, so I won't be charging for my time, and want to keep her costs down. Can anyone please point me in the right direction for a cheap replacement 300mm stroke left hand ram? A used one would be fine, and would match the rest of the double gate system which is about 10 yrs old and looks it.

Thanks!