Thanks for this very useful thread. I've been having problems on and off for the past couple of years with myeight year old SR-L39 model. The thing would begin bleeping for no apparent reason and the 'super freeze' symbol would light up. I removed the PCB and found the solder growth on the sides of at least three of the small black plastic micro switch housings, including the super freeze switch. This must have been tricking the brain into thinking the switch was constantly being activated as, once the growth was scratched away, the fridge freezer has functioned without any of the old issues re surfacing.
Mick, February 2010