As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 31,000 FT CABIN ALT STILL CLIMBED AT 500 FT MIN. DESCENDED TO 18,000 FT, CABIN ALT LEVELED OFF ATL 9500 FT. BOTH PACKS APPEARED TO WORK. NO OTHER INDICATIONS TO SHOW LEAK. REPLACED LT PACK VALVE CONNECTOR. LT PACK OPS NORMAL, A/C PRESS NORMAL.