If it's Triumph's fault, meaning it's a design failure rather than wear and tear, Triumph offers a goodwill warranty for anything outside the intial two-year period, which I have now used twice. I would just shop around, mention it and go with whoever acknowledges this fact. If you have no luck, then call Triumph directly. I don't know the number but I believe it's been posted on here before
Good Luck,
Good Luck,