As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB AT APPROXIMATELY 15,000 FEET, A DUCT CONNECTION DECOUPLED AT THE RECIRCULATION FAN. THE CABIN DEPRESSURIZED. THE CREW FOLLOWED PUBLISHED PROCEDURES AND LANDED SAFELY. THERE WERE NO INJURIES. DUCT CONNECTION HAD RECEIVED MAINTENANCE 2 DAYS EARLIER AND NOT BEEN PROPERLY SECURED.