My BOSCH dishwasher model 4052 has been trouble free for over 15 years, but is now giving me intermittent problems. The cycle occasionally stalls with the timer knob in the 9 o'clock position. Once I advance it slightly beyond that point, it will continue to the end of the wash cycle. I am looking for a source (online?) for a troubleshooting/repair manual. Can anyone steer me to the correct place? I have found a schematic, wiring diagram and timing diagram on this site, but am unable to print them out. Can anyone give me some advice on this question?