The Sylvania microwave in our 09 3075 poofed in less than 8 months. Call Keystone and request a replacement. They will pay for the return shipping but keep the paperwork to show you returned it. The replacement they sent me had a broken cooling fan shroud but rather than send it back I repaired it myself. So far it is working OK but it will overheat and shut down occasionally (making my DW very unhappy). I believe the new ones are vented to the outside but have not heard if this solves the problem. I intend to try and cut a vent in the enclosure this summer. I installed a fan behind the microwave but it does not prevent the shutdown.
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