As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CAPTAIN REPORTED AN INDICATION OF LT BLEED DUCT ON AND THE PASSENGER CABIN LOST PRESSURE, TO GO DOWN AS INDICATED IN THE QRH". THE MX PERSONNEL PERFORMED AN INSPECTION AND REPLACED THE GASKET CONNECTOR TO THE HIGH PRESSURE GROUND, ACCORDING TO TASK CARD 36-17-01-400-A0. THEY PERFORMED AN OPS CHECK OF THE SYS. ACFT RETURNED IN SERVICE.