After 8 years, my fridge F630 stopped cooling. Finally, had a chance to investigate problem. The evaporator coil behind aluminum sheeting had corroded and leaked refrigerant. During tear-down, I found out the condenser circuit includes a loop around front and left side touching exterior sheet metal for added cooling. Those with insulated covers might have better cooling with cover off. I will post a picture later, when I remove all insulation. Note: my insulation was hard/brittle/ waterlogged and damp in places.