Fridge Freezer embedded thermostat location?

I have a bosch fridge freezer (KIM28472FF/01) which seemed to go into defrost cycles of increasing duration, untill it was permenantly in defrost mode. The fridge fan cycle increaded and this seemed to stop the compressor. Both fridge and freezer were not getting cold. I read some reports about thermostats embedded in the foam insulation causing this problem. Has anyone had a simillar problem, and if so do they know roughly where to start looking for it?