Tenant Keeps Making Maintenance Requests

[Vi Huang]

I have a tenant who moved into my rental in California in Feb this year. They've lived in the home for 7 months and have made maintenance requests every single month. They installed bidets without my permission and created plumbing issues so I had to pay for a plumber to come out several times, I've had to replace a frontdoor knob and deadbolt last month even after we rekeyed the home prior to them moving in, the garbage disposal blades were jammed so had to call a handyman, repaired a broken window which my property manager claims was broken prior to them moving in even though the repair was made 3 months after they moved in. The most recent request was that the dishwasher isn't working. The repairs are starting to get more expensive and I'm not sure how to handle all these requests. Any advice or suggestions would be appreciated.