If you think option ARMs are a tricky product to service, you’re not alone. Rating agency Fitch has warned servicers to pay close attention to “operational issues” associated with the loans. “Borrowers are often unaware of the risks associated with this product, which are payment shock when the loan is recast and reduced equity resulting from negative amortization,” Fitch said in a report released last week. “These risks could severely affect a borrower’s ability…