In most states, if the item gave you some trouble while it was under the warranty (and you had it repaired by someone authorized by the manufacturer to make repairs), the manufacturer must extend your original warranty for the amount of time the item sat in the shop. Call the manufacturer and ask to speak to the department that handles warranties.
If your product was trouble-free during the warranty period, the manufacturer may offer a free repair for a problem that arose after the warranty expired if the problem is a widespread one. Many manufacturers have secret fix-it lists -- items with defects that don't affect safety and therefore don't require a recall, but that the manufacturer will repair for free. It can't hurt to call and ask.