I do not believe you need to be concerned about radiation leaks since the cabinet and door are properly designed to prevent that however the buzzing sound could be any number of things that could range from a simple fan to the magnetron tube failing.. That particular model is relatively inexpensive and service calls are not. In my opinion, it just isn't worth the costs associated with having it repaired when you can buy one for comparable money. You might find a local repair shop and have it examined and get an estimate of the cost to fix. If the costs to repair exceed the costs to replace then the obvious choice would be to replace. Your call..
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