Tenants of 7yrs wants full deposit back.

[Luke H.]

Tenants of 7yrs leaves this month and is already requesting full deposit back. I explained that I had 30 days to do the accounting.  

How do you guys handle these?
It was like that when we moved in.
That was from the weather not us.
That wasn't me, I didn't do that.
It broke over time not my fault.
I don't know how that happened.

Any advice or thoughts would be great, thanks!