As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI - FLIGHT 02391 - ON CLIMB OUT, THE AIRCRAFT WOULD NOT PRESSURIZE. LOUD WHISTLING NOISE WAS HEARD BY FLIGHT ATTENDANT. MAINTENANCE INSPECTED THE AIRCRAFT AND CLEANED DEBRIS FROM THE REAR PASSENGER DOOR SEAL. MAINTENANCE ALSO VERIFIED THAT NO FAULTS WERE LOGGED ON THE CDS. OPERATIONAL CHECKS WERE PERFORMED AND CHECKED GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.