Sounds like the fan may be the problem, I suspect that it will be less expensive to get a new microwave. IMHO, I would stick with the same brand, the reason being that the vent connection may be slightly different between manufacturers. I ran into this twice. If you do not have the original installation instructions, you may be able to find these online and compare to the new unit. Also, pay attention to the actual installation, 2 of these had the fan set for circulation back to the kitchen and NOT to the outside vent.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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