As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH AUTO PRESSURIZATION SYSTEMS FAILED DURING DESCENT AT APPROXIMATELY 22000 FEET RESULTING IN CABIN PRESSURE LOSS. REMOVED AND REPLACED A/C MOTOR DRIVE ASSY, NR 1 & NR 2 PRESSURE CONTROLLERS AND ADJUSTED AFT OUTFLOW VALVE PER AMM 21-32 AND TSM 21-32. PERFORMED NO GO ODI CHECKLIST 2120, 2130 AND 2150. ALL OPERATIONS NOW NORMAL(LP5057728)