Unless you are thoroughly competent I would fight shy of working inside a microwave. These can still be lethal even when unplugged
Phgs
May 2020
I can't locate one from my usual sources,and my guess is you will truly struggle to find one. You may get somewhere by calling Zanussi directly and asking to speak with their technical department.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix microwaves.