Question, not owning any of these machines, nor keeping up with these current builders, does JJP manufacture i.e. print their own boards or do they contract them out to manufactures that specialize in PCB printing?
It may be the outsourced PCB MFG that is only offering the limited warranty, thus JJP would extend the same length of time?
Thus this may all be just barking up the wrong tree.
Maybe this was covered already in 9 pages, I've not investigated it that thoroughly, as again, no horse in this race.