You may have a short circuit on the INTERIOR LIGHT BULB circuit in your microwave.
This might explain why the breaker trips every time you open the door.
If so, you would have to unplug and disassemble the unit in order to access the wires and light bulb socket inside the case in order to troubleshoot and repair the problem.
If you are unfamiliar with safe electrical troubleshooting and repair procedures, please be extremely careful or consider hiring an electrician to do the work. There are some hazardous components inside which remain dangerous even after the unit is unplugged.
Good luck.
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