On each pump there is one bolt from the reservoir tank to motor end cap that is rotten at the end of the thread.
Both end caps are rusty, one brush requires re-soldering.
Hydraulic valve bodies untested.
Reservoir tanks OK, fill screws need replacing, threads OK.
Armatures 'look' OK - untested.

Thanks for posting those images, Sweep.
I'll see what the one that's on its way to me is like - I bought it as "working".
I was tempted to get a company I've used before to service the motor - but maybe it's a case of "let sleeping dogs lie"?