As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT-LGA FLT 1498 - DURING CLIMB-OUT, THE AIRCRAFT WOULD NOT PRESSURIZE. THE FLIGHT ATTENDANT REPORTED A LOUD NOISE AROUND THE L2 DOOR. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE WAS UNABLE TO DUPLICATE THE PROBLEM. THE AIRCRAFT WAS PRESSURIZED AND ALL CHECKS WERE NORMAL. (M)