I think I would try a letter to Bosch customer service first. Long shot but you never know. You are a customer, You bought bosch because of their reputation for well made products. The shock and disappointment you felt when you realised a major component failed only 3 years into the life of a product that should have lasted at the very least 5 years
you know lay it on a bit thick
all in all this component should not have failed and the way the machine is built makes it not repairable. There is rumblings in Europe to try and stop a lot of this. We are talking about global warming and making sub standard units the need scrapping every few years. That is not sustainable
Dave