ok, so time to take apart the powder room toilet
and see if the replacement dealio from Kholer does the trick.
Relatively new toilet... all cool-as-cucumbers with the fancy spancy float valve...
and it still "runs on".
I got sick of whacking the side of the tank to shut it up. :)
cross your fingers.
plumbing jobs of any sort what-so-ever, tend to be cursed.