Up your's Bosch
11 years ago I had a Bosch fridge-freezer which failed expensively (uneconomical to repair) just outside warranty. As I'd heard of several similar failures, I decided to investigate the problem myself, and came to the same conclusion as their service engineer - that the controller PCB had failed.
However on closer inspection and with little more than schoolboy maths it was obvious that the PCB copper area that they'd allowed for sinking heat from the voltage regulator was insufficient. This had led to catastrophic failure of the processor - along with it's embedded program.
An email to the European CEO with the calculations and explanation got a new fridge-freezer delivered by Bosch themselves a few days later.
In case you're wondering, I did check the new fridge-freezer's controller PCB and they'd redesigned it, so obviously they'd known all along.
Company's can be bastards - or they can be fair. Bosch only did the right thing only when pushed, so I've steered clear of them (where possible) since. I know they make some good stuff but they've lost my custom.