As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURIZATION STARTED TO CLIMB AT A RATE OF 2000 FT PER MINUTE DURING DESCENT TO KLAS. PASSING THROUGH FL280, A LOUD POP WAS HEARD AND RUSH OF AIR BEHIND AIRCREW AND CREW IMMEDIATELY DONNED O2 MASKS. PASSING THROUGH FL220, REGAINED CONTROL OF PRESSURIZATION.