As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 157 - DURING CLIMB-OUT FROM BOS EN ROUTE TO PIT, CAPTAIN NOTICED AIRCRAFT WAS NOT PRESSURIZING. THE CABIN PRESSURE WAS NOT HOLDING. FLIGHT WAS AT 8,000 FEET AND CAPTAIN DECIDED TO RETURN TO FIELD AT BOS. ON DESCENT AND APPROACH, CABIN PRESSURE WAS ERRATIC. FLIGHT LANDED WITH NO FURTHER INCIDENT. MAINTENANCE CHECKED ALL DUCTING AND PRESSURIZED AIRCRAFT WITH BOTH ENGINES AND APU. ALL SYSTEMS OPERATE NORMAL. (M)