How to ask a tenant to fix something

[Michael Bowser]

Hello everyone,
I'm a new landlord and I'm just trying to find the best way to politely ask a tenant to fix something. I recently encountered that the deadbolt on the door is broken and what happened was the door must have been slammed shut with the deadbolt open and it cracked the door as well as breaking the deadbolt. So I am trying to go about having them fix it in a nice way. I have to go back to the apartment anyways and fix a drainage issue on the tub but I'm trying to find a way while I'm there to inform them that they need to fix the door or get the cost of it being fixed to me to fix it. 

Also does anyone else fix drainage issues in tubs and sinks that are due to normal wear due to hair and everything else.

Thanks