Definately take it to your shop. Maybe nothing at all wrong with it. But may just need to be 're-wired'. Possibly a new cable and string. Longdraw is right about Martin Archery. I have a Firecat that I had a brand new string put on at the shop. When I took it home and started to shoot to sight it in the string exploded on me the same as a dry fire. The upper limb cracked. Martin replaced the limbs and cam system with their new cams and limbs. So now I basically have an Alien with a Firecat riser! The bow is faster and smoother now than it ever was.
I hope your cousin learned a lesson about touching someone else's stuff without permission?