I got my Z-Slash like.... 6 months ago.. X_X some paint chips here and there but not many.. Recently I got my strings tensioned at 24 and a week ago, I noticed that the head shape is kind of deformed .On one side of the racket, the corner of it is kind of bending inwards(hardly noticeable).. Would I be able to send it back to Yonex? ( I have warranty but im not sure when it expires!)Also I cut the strings cause I'm scared its gonna get worse and I kept it somewhere safe so nothing happens to it D: BTW! usually how long are warranties before they expire?