Ge-profile-microwave-xl1800-not-heating, a couple of clarifications please: 1) this microwave is built into cabinetry above stove. by taking the outer cabinet case off, will that get me access to the back of the unit where the cord comes in or do i have to take the entire unit out to get to the back where the cord comes in?. View this repair: http://www.appliancevideo.com/ge-jdm1630wb004-microwave-diagnostic-has-power-but-is-not-heating-magnetron/ troubleshoot your trusty ge buil..., hello, the smart board, when i looked at it, i can't seems to find a small transformer, i just can't figure out the rectangular thing on the right side if it is a transformer. anyway, if the thermostat is open circuit, that means it is defective. it should be closed as the other one that you tested. have you seen what is inside part 9999?