Technician Taylor arrived on scene to investigate reports of toilet not working properly. Client brought technician to toilet in downstairs hallway. Technician found a 10-year-old Kohler toilet with a bad flush valve gasket. Technician recommends replacement and client accepted technician will go to parts house and pick up proper pieces needed for installation. . Technician acquired parts and returned to scene. Technician replace flush valve gasket and reinstalled. Technician tested to ensure proper operation. Technician cleaned work variable trash and debris. Technician documented with photos and notes. Technician collected signatures and payment..