How to Troubleshoot & Replace Ge AP6783280 / WB03X27704 Locking Button

The old cover wave guide had old food, debris on it and it created sparks in the microwave. The replacement guide and button I ordered from AppliacenPartsPros came in two days (just as promised) and fixe the problem right way, Thank you!!!! I am a returning customer and will keep coming back here for my parts needs. 

Bought new button from Appliance Parts Pros and simply replaced broken plug. 

First called GE to get the part number and cost. Then checked the web for comparison pricing.