Whirlpool MH1160XSQ Microwave Review

I recently purchased a new home which has a Whirlpool Microwave (MH1160SXQ).  When I first moved in, about five months ago, it made a humming noise.  Then the noise went away.  Well, last week the humming started again, louder now.  Called the appliance store.   Repair men came and said it was the transformer and something else.  Would have to order the parts, then come and take the micro to the shop to repair.

This item seems to have been defective from the start and should NOT be repaired, but should be replaced.

It was manufactured in 3/08.

This is five months into the warranty.  After 1 year the problem would be mine.