I have a Seiko 5 6119-7083 that now doesn't run more than a few seconds then stops.
I'd like to restore it.

My question: Is it still better to service the movement? or Can I swap the movement with another fresh one?

Which Seiko movements can fit in this watch? I can even buy a cheap new Seiko as a donor if this helps.

Movement is 6119c

Many thanks