Hi. Someone had the same problem a while back, and I laid out all the information they needed to get back in business, and they got the problem fixed. I told them in detail what product to get and where to get it.
Take a look at posts 12 and 14 by me, and the picture in post 15, in the following thread:
https://terrylove.com/forums/showthread.php?18981-Lawsuit-or-Recall-of-Am-Standard-Champion-toilets
Let us know if we can help in any other way
(Terry, at least when he tells us "Accelerator", we know he doesn't have the tower flush.
) [I wonder if there are any consumers out there who were mislead by the alleged "4-inch" flush valve, which is actually 3 inches. I have never done a class action suit (actually, maybe years ago we had one that was going there, but it settled), but it might be fun!]