As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT DIVERTED TO PHL ON ACCOUNT OF PRESSURIZATION ISSUE. EMERGENCY DESCENT MADE. CAPTAIN HAS CONTROL OF CABIN AND NO EMERGENCY LANDING DECLARED. MAINTENANCE REMOVED AND REPLACED PRESSURE REGULATING VALVE IAW AMM 36-11-52. OPS CHECK GOOD, NO ENGINE BLEED 1 ON ECAM.