A sewer specialist will inspect the system for you for about $200 and stick a camera in the pipes (drain tile).Drain tile can get damaged for example by roots (Willow trees are really bad and will go a loog way to reach the pipes), but sometimes its just age.The way you deal with the issue depends much on your strategy.

The sink and tub clogged up again on that day, so I called the city, they came out that day and ran a camera and found that it was clogged on their side, the next 4 days they dug up the side walk, my yard and the street, replaced the pipe on their side and fixed everything.

Installing security cameras? 

We've had a robbery claim as well.About 25 years ago, someone broke in and got off with a lot of our belongings (electronics, cameras, jewelry etc).

We do get some 3rd professionals to come out and help us (plumber with sewer cameras, roofers, etc.) but we have our team walk the units using our forms. 

Here's the bigger question--have you gotten a security camera for the property?

You should have installed monitoring cameras.

I got hits from all of these methods.For the online ads, I borrowed a camera and a tripod. 

Amazon sells fake cameras.

If you are using a property management company make sure to tell what kind of tenant you want (FICO, income to rent ratio, section 8[I don't recommend],prior evictions, criminal history[sex offenders], marijuana on property)If your unit is a studio or 1 bedroom you can a lot more money wit Airbnb, most markets now have Airbnb property management that handles all turn-over things such as cleaning, dealing with guest, we use and August Smart lock that sincs with Airbnb so you can see on when they come and leave plus a security camera outside the unit to make sure there is no extra people or a party going at my unit so far we are making more than double from what we use to make on it with a regular tenant.