Flyman,
It sounds as though pack 2 had reverted to one of the fixed temperature modes (which was very cold!) and as you were getting pack 1 air in the cockpit, you were getting a much more reasonable regulated temperature in there. My thoughts were that by simply supplying the whole aircraft with Pack 1 output and having Pack 2 switched off, the whole aircraft should be regulated as normal at the selected temperatures rather than just the flight deck. Haven't had this fault so haven't tried it myself...!