Summary: I noticed today some steam in the inner part of the door (between the outer glass and the inner metallic grid on the door). I looked carefully and there is a tiny hole in the inner plastic film of the door (the plastic film shielding the metallic grid). It looks like it melted.
Summary: The only reason I bought this was to downsize very slightly due to changing my kitchen layout. My previous Panasonic was/is in perfectly good working order after a number of years, but was slightly too high.