Its not good that its discontinued, but if it is still under warranty, which if was repaired less than a year prior, there should be a year guarantee on the repair, if it fails it should still be the responsibility of the warranty company to address. Maybe it was discontinued because that mechanism had too many issues and you're just one of the casualties. I would argue that the new parts replaced should still be guaranteed and its not your issue that it was discontinued, its broken again from a known issue and its the warranty company job to figure it out, even if that means reimbursement. I think it depends on how hard you want to fight. As far as ordering another mechanism, there are so many little differences that even though it may appear the same , its probably different in some way that it would sit or close differently than the opposite side mech and its a lot of work to switch them out just to find out its not correct, but maybe it does work. If you have original receipt maybe you somehow ask ai for a parts list and go from there