As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PRESSURIZATION WAS SET AT TOP OF DESCENT AND POWER WAS PULLED BACK (1.3 EPR), THE CABIN BEGAN TO CLIMB AT 300 FPM. CABIN ALTITUDE REACHED 10,000 FT AND CREW TOOK OVER PRESSURIZATION MANUALLY. CREW WENT ON OXYGEN. FOUND COLD AIR DUCT LOOSE AT WATER SEPARATOR-TIGHTENED DUCT AND CLEANED CABIN PRESSURE CONTROL AIR FILTERS. OPERATIONAL CHECKED GOOD.