I'd call the plumber, ask if he knows what caused the slow drain - and verify he was paid in full.My lease also says they are responsible for clogs unless the stoppage is between the outside of the unit and the street.I'm guessing that being a A Class tenant they did not want to put up with even a slow drain and have the $ to pay the bill and know it's their responsibility and that they're only looking for a little goodwill or a 'thank you' in return.

You don’t want a total stoppage because of one or two things.

If it was going to create a work stoppage, we allow him to purchase it, keep the reciept, and we pay him back ASAP.

A sudden forced stoppage of entitlements due to an economic collapse is likely in the relatively near future and that will be disasterous for the country and the rental busienss.

Is this on top of or in addition to the stoppage of foreclosure that took place for most banks from Dec. 1 - March or April 1 ??

If the toilet or sink is always stopped up, it means they are doing something wrong (I always have plumber go through house before they move in to make sure no stoppages in lines).

Also in my lease the tenant is responsible for all drain stoppages.

For example, my lease says that "The tenant shall be charged for repair of drain blockages or stoppages unless caused by defective plumbing parts or tree roots invading sewer lines."  

Fines and work stoppage will occur if you get caught.  

Tenant shall be charged for all damage to Premises as a result of failure to report a problem in a timely manner.Tenant shall be charged for repair of drain blockages or stoppages, unless caused by defective plumbing parts or tree rootsinvading sewer lines."