http://www.mathewsinc.com/
Being a Mathews owner, you really should have this site bookmarked on your computer. Every thing except your string and cable is covered under your warranty. Thats lifetime, original owner. You have a serial number on your bow and I' m sure Mathews knows the original owner assigned to it. Have you taken it back to the shop you purchased from for warranty work? Have you twisted the string yourself? Don' t get in a tizzy because someone mentions cracked limbs could be the cause. If you can' t twist them yourself, or don' t have access to a press, take it to a shop. Tell them your bow is suppose to hit 70lbs. and it only goes to 64 or what ever. If they set your cam rotation while maintaining A to A and brace hight and you still don' t hit 70, contact Mathews.