As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS OF CABIN PRESSURIZATION OCCURRED AT 31,000 FEET EN ROUTE. CREW ACCOMPLISHED EMERGENCY DESCENT TO 10,000 FEET. FLIGHT WAS CONTINUED TO DESTINATION AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND LOOSE RUBBER BOOT BETWEEN LEFT AIR CYCLE MACHINE AND HEAT EXCHANGER. SECURED BOOT. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.