What was found
(CAN) REACHING FL290 ABNORMAL CABIN RATE. DOING THE CHECK LIST, UNABLE CONTROL CABIN ALTITUDE. INITIATING EMERGENCY DESCENT AND TURNING BACK TO DEPARTING AIRPORT.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) REACHING FL290 ABNORMAL CABIN RATE. DOING THE CHECK LIST, UNABLE CONTROL CABIN ALTITUDE. INITIATING EMERGENCY DESCENT AND TURNING BACK TO DEPARTING AIRPORT.