Microwave oven

I have a GE microwave oven that just stopped heating. I have checked
and found the problem to be in the high voltage section. I found the
high voltage diode shorted and the high voltage capacitor going bad.
I've replaced both of these, but it still does not heat. When I
rechecked I again found the diode shorted within 1 minute of running.
The magnetron tube was replace 3 months ago and the transformer tests
good. The magnetron tube show no short to case. Also no shorts in
transformer, and correct ohms on each winding. Has anyone run into
this, or have any ideas?
Retired

.

Loading