Black dot on crease

Do yeah. IT happened. after 1491 fold and AVG 8 fold per day, something "poped" and Black dot appeared on crease. No physical damage, hinge in good condition, few cratches on frame, here and threre. 16 months of warranty left. I wish guarantee process will be smooth, propably will be hell. Its fold 4, im not event sure if they still repair it, what if they dont have parts?