Did you use a credit card to purchase the Denon from Cruthcfield??? If so some of the gold or platinum cards offer automatic warranty extension. I think you would pay to have it repaired and then they would reimburse you although there may be a small deductible. It might be worth contacting your CC company.
As well considering when it started failing I would also contact Denon and tell them it started failing a month and half back and see if they'll do anything for you. It's worth asking as I'm sure Crutchfield is an authorized Denon dealer.
