Damages, repairs, and deposits

[Michael Perner]

 One of my tenants has reported water damage to the flooring just inside the front door.  They claim is has just recently started to warp and peel up.  I had 2 plumbers check in and out, pressure test, etc., and there are no leaks anywhere.  I'd like to hold the tenant responsible, but my property manager keeps suggesting it may not be their fault.  The same tenant has already had a mysterious issue with a ceiling fan I had to replace. My gut is they did something, and did not report it, and now are trying to CYA.

Of course they want it replaced now, but I am hesitant as I don't want them to damage it again.  They have about another year left.  

Am I being to hard on this? Probably under 1k to replace the entry flooring. I'm also a bit irritated my property manager seems to be on their side, not mine. 

   I want to do what's right above all.  Any experience or thoughts on this would be appreciated.

Thanks