As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECLARED EMERGENCY - AT 36,000 FT AIRCRAFT SLOWLY LOST PRESSURIZATION. NO LIGHT ON PRESS PANEL, OUTFLOW VALVE WAS FULLY CLOSED. PRESSURIZATION WAS REGAINED AT APPROX 14,000 FT IN DESCENT. NO POPS OR BANGS WERE NOTED. REMOVED AND REPLACED APU BLEED AIR CHECK VALVE PER MM.