It's been a decade since, but when my spendy Harken traveler block system started failing, I sent it to them to rebuild. ( I expected to pay for work done.)
They sent it back with some of the old parts replaced.... and marked the invoice "no charge."
IMHO, they invest a lot into R&D, and stand behind their products.
Times might have changed, but often a polite inquiry asking for advice on what bits to rebuild or replace will get you at least helpful advice, and sometimes a lot more.