Amen!BTW I changed my order from two K-11456s to two Toto Drakes with SanaGloss-- can I get an amen?
On the repair, I would try the flapper first.I note that the inside of the flush valve feels gritty, so I tried to wipe everything in case debris was impeding the seal. Didn't work. And it still feels gritty.
The inside of the flush valve?
The inside won't matter, but the face where it seals will matter.