As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, SWAPPED BLEEDS FROM THE APU TO THE ENGINES AND THE NR 2 PACK SHUTOFF. THEN GOT A NR 1 PACK HIGH PRESSURE. LEVELED THE PLANE AT 10000, AND THE CABIN ALTITUDE BEGAN TO CLIMB. DECLARED THE EMERGENCY AND RAN THE QRH. A NORMAL LANDING WAS ACCOMPLISHED. REMOVED AND REPLACED THE RIGHT ENGINE PRSOV, OPS CHECKED AND LEAK CHECKED GOOD IAW AMM. PERFORMED OPS CHECK FOR PRESSURIZED THE AIRCRAFT IAW AMM. OPS CHECKED GOOD.