Am I responsible for problems after sale?

[Amy A.]

Two years ago I flipped an old home located in the same small town I live in.  I had new chimney liners and caps and a new roof put on.  Shortly after the sale, the buyers called me to ask about water coming in around the chimneys.  I sent back my roofer and he applied more sealant.  They still leak.  I called my chimney guy and he went back and worked on the caps.  They still leak.  The  mason told them that it's because I wanted it done cheaply.  Thanks for throwing me under the bus!  I always want a good value, but not shoddy work.  Now they're demanding that I hire somebody to fix the problem.   Nobody seems to know where the water is getting in.  This is a small town and I'd hate to hurt my reputation.  What would you do?