Potential Safety Hazard to Whirlpool Microwave

My husband purchased the house which included the Whirlpool Microwave Hood, model # MH8150XMQ - 0. Recently the door has formed cracks that go all the way through the other side, and cracks are also on the plastic grill above the door. I contacted Whirlpool Customer Service, and after explaining the situation to the representative "Jane", I was told "The warranty is expired. There's nothing I can do for you. You can purchase parts, or buy a new one." I am a concerned consumer as there have been recalls on a very similar model to this one because of fire hazards. If there is serious cracking on the outside of this product, I am concerned about the cracking on the inside and what safety hazards this poses. I am passing all this info to other stores who sell Whirlpool microwaves so this problem can be addressed before someone seriously gets harmed. I have also contacted the Whirlpool corporate headquarters via e-mail to address this problem. I have yet to hear from them.