no that can cause fdurther damage! my initial thoght is the high voltage diode is bad, however you need a volt ohm meter to check it for continunity. you access it by removing the cabinet that surrounds the microwave.
I still think it is the above part, but it can be the magnatron too! The diode is the way to check. You will not have access toi the equipment to check the magnatron !
A diode only allows current to travel in one direction and you check a diode for that quality.