On Saturday, November 21, 2015 at 7:39:45 AM UTC-6, Al roarke wrote:
I have a slight problem where I can hear my commode running. It does
this for about 15 seconds maybe 4-5 times a day. At first I thought the
flap needed replacing and did that, but still doing it. To help maybe
rule out the flap completely, I placed a weight on top of the new flap,
the colored the tank water. After an hour, I could see some color in
the bottom of the bowl. I am using a Fluidmaster valve, could this be
going bad? Thanks.

The top seal can be replaced on a Fluidmaster...something like a quarter turn, after you remove the black cap. You may even find it dirty...