As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#404, SJU-JFK. (AIRCRAFT PERFORMED AN AIR TURN BACK TO SJU) 'ON CLIMB OUT AIR STOPPED FLOWING FROM VENTS, CABIN CREW REPORTED HISSING SOUNDS THEN WE EXPERIENCED LARGE PRESSURE SPIKES AND THEN NO AIRFLOW FOLLOWED BY MORE HIGH PRESSURE FROM VENTS. PACKS TURNED OFF ENG 2 BLEED PRESSURE VARIABLE 30-40 PSI; REMOVED AND REPLACED #1 SYST. CABIN PRESSURE 11HL CONTROLLER IAW A320 AMM 21-31-34. OPS CHECK NORMAL PER 21-30-00. NO LEAKS NOTED.'