kitchenaid long cycle

kitchenaid architech series dishwasher working fine last 5 years or so, cycle now taking 3 hours to complete even though display counts down from 70 or 80 minutes but takes a lot longer, lots of crud on upper rack dishes, dishes piping hot when door is opened after it finishes or when I stopped it with 40 minutes left after it had been at 40 for 10 minuted

chopper assembly and water level appear ok, shut it off 15 minutes into the cycle, dipped my fingers into the water in the bottom, it was quite warm but certainly not boiling hot, shouldn’t it be?