Does a Buyer have any recourse once a sale is closed

[Tom Pinkney]

Here's my scenario; I'm selling a house in TX near Fort Worth and am about to close on it. In the repair amendment, I agreed to have a clogged drain unclogged. I have unclogged it myself and it is draining just fine. I am worried though that should the buyer eventually have an issue with it clogging again, whether it be a day after the close or a decade after, they may come at me to have it fixed.

These buyers are on the border of being irrational with the requests they have made and it would'nt surprise me in the least if they'd try squeezing me again...not just for the drain but for any other issues.