As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- ON FLIGHT 2494 RIGHT PACK CAUTION MESSAGE DURING DESCENT. PERFORMED CAUTION ABNORMAL CHECKLIST FOLLOWED BY UNPRESSURIZED FLIGHT CHECKLIST AFTER DESCENDING BELOW 10,000 MSL. REMOVED AND REPLACED NR 2 ACSC. OPEATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.