As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 180 PHX-JFK, CREW QUICKLY DONNED OXYGEN MASKS AND REQUESTED AN EXPEDITED DESCENT DUE TO PRESSURIZATION PROBLEMS. CABIN V/S FLUX BETWEEN +- 1700 FT/MIN ABOVE FL 300. BOTH PACK FLOWS WERE HIGH WITH RIGHT PACK FLUX BETWEEN HIGH AND LOW SLOWLY BLEED PSI AND OTHER INDICATIONS NORMAL. REMOVED AND REPLACED NR 2 PACK FLOW CONTROL VALVE IAW MM 21-51-51. OPS AND LEAK CHECK OK.