Whirlpool fridge WRN33NWB6 we have had this in storage for several Years wrapped up and stored very carefully. Now we have turned it on and it's cold inside but not as cold as it should be, the freezer also seems Only About as cold as a normal fridge. Also there is a twist knob on the rear of the fridge which has snapped off, we can still turn it but we have no idea what it does... Perhaps this is the problem???