Barry,

I also do the test with a cup. I use the regulation sized sippy cup, nothing fancy.

Fill the small cup and turn on for 1 minute. If water is hot to touch, I note on report that a cup of water was heated after 1 minute test.

I also check to make sure the turntable is operable and that the unit is properly supported. Check to make sure there is no damages to the door or the glass panel.

Another thing I do is make sure that the recirculating fan is venting properly. Many of these have had to fan cover panel removed as if they are going to be vented to the exterior; but many I have found vent to the bottom of the above cabinet.

I also make note if the bottom surface light is not operable and the condition of the filters.

rick