As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CLIMBING THROUGH FL 240, CABIN BEGAN A CLIMB OF GREATER THAN 2,000 FPM. PERFORMED CHECKLIST, CABIN CONTINUED TO CLIMB UNCONTROLLABLY. RETURNED TO SAN JUAN (SJU). GENERATED FROM PILOT REPORT. REMOVED AND REPLACED AIR DISTRIBUTION DUCT PER MM, CHAPTER 21-20-00. REMOVED AND REPLACED MANUAL PRESSURE CONTROLLER PER MM CHAPTER 21-30-00. (X)