As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 320 WITH LEFT PACK OFF RECEIVED CABIN ALT WARNING, WE PUT ON MASKS AND TURNED ON LEFT PACK. WE RAN QRH PROCEDURE CABIN CAME BACK BUT RIGHT DUCT PRESSURE WAS LOW 5-10 PSI. WE WERE IN ICING SO ENG HEAT WAS ON. WHEN WE CAME OUT OF REMOVED AND REPLACED RT ENG. PRECOOLER FAN VALVE AND FAN AIR TEMP SENSOR AS PER MM 36-11-16-004/36-11-17-004. OP'S CK'S GOOD. ACFT OK FOR CONTINUED SERVICE. IPC 36-11-01-08/36-11-16-05.