As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)UNABLE TO MAINTAIN PRESSURIZATION WITH ANTI-ICE ON. TO MAINTAIN PRESSURIZATION REQUIRED AN E.P.R. OF 1.6. SUBSEQUENT MAINTENANCE INVESTIGATION REVEALED DUCT HAD SEPARATED FROM LEFT AIR CYCLING MACHINETO LEFT WATER SEPARATOR. DUCT AND WATER SEPARATOR SECURED. BOTH PACKS GROUND RUN.