Bona, does the bow still shoot? Meaning it will but the strings lays out to one side after? I have a Bob Lee that's about 14 years old, and when I draw it without shooting, the string will come out to one side. I never sent it back, just lived with it, It still shoots great and sits mostly strung.
Anyway, it could be an alignment problem with the riser. Call PSE and ask, tell them the problem still there. May be tough sending back during hunting season if it's his only bow! But if you can't shoot it, they should take care of it, no excuses. Good shootin, Steve