If you can crank it fully shut with an Allen key, the motor may be at issue.
If not you need to make note of which part is binding or broken in the mech.
Eg on a wag the blind pushers may pop out jamming the mech assy and or small parts may fail.
The latter case may require dropping the headliner and replacing the cassette with one from a wreck.
Mine has motor brush issues, I’ll try replace the brushes just for fun.
https://www.google.com.au/search?biw=56 ... GY%2F1w%3D...