As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2063 - AIR CONDITIONING PACK HOT LIGHT CYCLED ON AND OFF DURING CLIMB-OUT THROUGH 8000 FEET. RAN CHECKLIST, MANUALLY WARMED THE TEMPERATURE, CAUTION LIGHT EXTINGUISHED. REPLACED PRESSURE REGULATING VALVE IAW AMM TASK. OPERATIONAL CHECK AND LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.