Yes, I had that monster. The magnatron is guaranteed as you say. I was
lucky to have a service policy on my house and appliances at the time
mine went bad otherwise they wanted $250.00 labor to replace the
magnetron. If I had to pay that much, I'd throw the whole unit out and
but another one.

sid wrote:
I have a GE XL 1800 over the range Microwave that has stopped heating.

When you start it, it hums for a 1/2 second and then all noise
(associated with heating) stops. All else works control panel, light,
turntable.

I have seen a lot of discussion that talks about the magnatron and the
Diode.

According to the GE manual the magatron is warranted for 10 years,
excluding labor.

Does anyone have any experience with this model of Microwave oven ?

Thanks