Our Bosch appears to have developed a fault after 8 years of service. It appears to stick when going through cycles, typically when in the rinse mode or spin, but it has been known to stick on various modes. When the timer sticks the Bosch emits a low buzzing sound. The pump and motor all appear clear with voltage present at the motor. I now feel the problem lies with the timer board??? Any ideas and if you agree where and how much are the timer boards.