As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD FLT 5929 THE CREW REPORTED THE AIRCRAFT WOULD NOT PRESSURIZE ON CLIMB. LOUD SQUEAL FROM RIGHT SIDE WINDOW WAS REPORTED AS WELL. MAINTENANCE INSPECTED AND RELEASED AIRCRAFT IAW MEL 21-30-00/3. MAINTENANCE INSPECTED AND PERFORMED AUTO AND MANUAL PRESSURIZATION CHECKS. NO DEFECTS WERE FOUND AND THE AIRCRAFT WAS RELEASED FOR SERVICE.