As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL280, THE CABIN PRESSURE CLIMBED RAPIDLY. THE FLIGHT CREW INITIATED AN EMERGENCY DESCENT TO 10,000 FEET AND GAINED CONTROL OF CABIN PRESSURIZATION. NO FURTHER PROBLEMS WERE NOTED AND THE AIRCRAFT LANDED AT DESTINATION WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT WATER SEPARATOR AND RIGHT COALESCER BAG. OPERATIONAL CHECK NORMAL.