Toilet was only two and half years old and not flushing at all. All my other toilets are perfect even though they are much older. Mr. Kochman came and diagnosed lime scale buildup. He said: "I aim to fix problems so well you don't see me again for the same issue." Returned two days later with industrial cleaner and fixed the entire problem and only charged for one service call even though he came twice and texted frequently to offer advice. Then, he called me to tell me that he had an identical problem with the same model and offered to discuss with the manufacturer and see if the entire unit could be replaced! Still in process, but main thing is (and I have had him for a tap issue as well): he is HONEST, POLITE, KNOWLEDGEABLE, and doesn't waste your time or your money!