GE Microwave keeps blowing the fuse.

This 9-year-old microwave all the sudden stopped working with a blown internal fuse. The fix was easy and cheap enough; however, I did not get a definitive answer on what part actually fixed it, the latch board or the switches or a combination of both. Latch board part# GE Wb06x10610 amazon part # AP3866945 $55 switches also through amazon $9