First, they are not in Peoria Heights and appear to be working out of a home. They said they were familiar with Kohler stools. They replaced two stool interiors for an unitemized cost of $1242.00. One stool works fine after they came back and adjusted it. The 2nd stool usually flushes properly when you hold the flush handle down. Even then you need to wait to make sure the plunger settles. Otherwise, the water will continue to flush down to the sewer. Four times they have come back to get the 2nd stool to operate properly; a stool which is exactly like the other stool. Same age, same parts. They no ;longer return my phone calls.