As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH ONE PACK MEL'D ON TAKE OFF FRON SLC, RT PACK MADE 3 PSI DIFFERENTIAL PRESSURE UP TO 10,000 MSL THAN THE DIFF PRESSURE REDUCED TO 0 PSI AND THE CABIN CLIMBED TO 10,000 FEET RETURNED TO SLC AFTER REFERENCING QRH. GROUNDED - YES. ON DEFERRAL.