Your lock malfunctioned and someone broke in. 

My two cents to your issue would be to analyze the roof from the point that you know it is malfunctioning: the fasteners.

Our realtor also found a septic inspection report from earlier this year that says the septic was showing signs of malfunctioning.

I don't have STR but if I did what I'd consider is:Do competitors have it and is it the difference between them selecting my unit vs theirsIf the playstation decides to malfunction during their stay are they going to write you a negative review for it or call you asking for one that workWhat if they put one of their own games or a redbox in, it gets damaged, are they going to ask you to reimburse themHow many bad #&@ kids or drunk adults are likely to break this playstation and act like they don't know what happenedCould the money you spend on the playstation and games be spent on something more attractive (larger tv or more TV's)I think that's my long way of saying no. 

But the detention pond could malfunction and overflow, flooding the nearby houses...

It's not my fault my lease just so happens to end in March and the meters were malfunctioning. 

Not to mention the potential safety hazard of a malfunctioning furnace.

Also if I was the tenant, would I want to renew a release on a house where things keep breaking or malfunctioning? 

Tenant will notify Landlord in a timely manner of any damages or problems as they arise, including damages caused by Tenant, malfunction of appliances or fixtures, and water/moisture leaks and spots.

After I closed on my new 5-unit property this past december, I had to replace two heaters that were at their end of life and malfunctioning.