S-L volans capstan

[Yoya]

Hi
I have a simpson lawrence Volans 12V capstan with an electric motor . about a year ago the chain was pulledout under load when the winch was locked. That killed the motor dead for some reason. Been operating it manually ever sincewithout a problem multiple times. now the capstan is very difficult to operate. need a lot of force to turn it clockwise to collect chain.
I removed all above deck compnents, they are well greased and free to rotate. The spindle, or shaft is seized.

I can try to remove the below deck parts - gearbox and motor. however it seems it may be difficult to remove and obviously to reassemble the - there is no room below the motor and gear to drop the assembly as there's a compartment with a shelf flush up against the bottom of the motor.

has anyone experience with these S-L Volans capstans being seized? Is this likely a gear issue? a motor issue? a stuck brake ?

I have an exploded diagram + order of parts to dismantel the below from above deck assemblies

Is it likely ill be able to free the shaft to rotate easily again. I'm on anchor and can't be without windlass for long
Could not find much about S-L Voland capstan maintenance or repair in the forums or online.