You can order any part by visiting www.washerbearings.com/parts to order replacement parts other than tub bearings and seal.
All you need is the model number and a description of what need replaced to find the appliance part you need.
I recently worked on an GE Advantium 120 microwave convection oven for a friend. The symptoms were that there was no heat in both microwave and convection modes. Everything else seemed to work. My friend replaced the relay board thinking that was causing the problem. After taking the unit apart it turned out that the 2 relays that control the magnatron and the heaters were not energizing. I took a chance and ordered the WB27X10858 logic board and it is now working.
Here is a link to the service manual PDF GE Advantium 120 service manual
Here is a list of all of the GE Advantium models that use the WB27X10858 logic board appliance part:
PSB1000NBB01
PSB1000NWW01
PSB1001NSS01
PSB1200NBB01
PSB1200NWW01
PSB1201NSS01
SCB1000KBB01
SCB1000KBB02
SCB1000KCC01
SCB1000KCC02
SCB1000KWW01
SCB1000KWW02
SCB1000MBB001
SCB1000MCC001
SCB1000MWW001
SCB1001KSS01
SCB1001KSS02
SCB1001MSS001
ZSC1000KBB01
ZSC1000KBB02
ZSC1001KSS01
ZSC1001KSS02
ZSC1201NSS01
ZSC1202NSS01
You can order the WB27X10858 logic board part by visiting www.washerbearings.com/parts to order replacement parts. When working on appliances make sure that you practice safety and unplug machine when opening the case and use care when probing with a voltmeter since you have to have it powered up when testing for voltages.
Until next time...
Jeff