Hi Leon909,
It is a great to see that you have updated your situation and how to fix it for the future readers who might need some help same as you. I have exactly same problem. my user manual is in French so i can't understand it. So please describe it a little bit how to find the faulty micro switch and where it is exactly located and please attach a screenshot if it is possible. Thanks for your posts and at least it gave me where i should focus on.
Regards,
Manlai,