Broken stove door who is responsible for fixing??

[Leah Holliday]

Question I have a rental property in St. Paul MN. My tenant is asking me to come and replace the stove because the front of the oven door came off. When looking at the pictures the hole where the screw goes is broken. I believe the tenant unscrewed the screw to try and clean the glass in between the doors and broke it. ( My theory) Would this be my responsibility to fix or theirs. This tenant has had 7 maintenance request in the past year. The prior tenants were there for 10 years and did not have any issues. This is a well maintained 3 bedroom home. Who is responsible for fixing this??? 

??