[Hutch]

Yes they should roll freely,
Some of the usual suspects do make a kit to replace just the rollers.
I would think that if soaking them in lube doesn’t free them up then the best bet would be to replace the regulators.
This is the kind of job you want to do right once.
Stuck rollers will put stress on the other parts of the mechanism and eventually cause other problems.
When installing you should use lithium grease which is water resistant, due to the fact that water will enter the door.