As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 572 - DURING CLIMB-OUT FROM IAH, AIRCRAFT WAS UNABLE TO PRESSURIZE DUE TO A LEAK AT THE FORWARD ENTRY DOOR. FLIGHT RETURNED TO FIELD AT IAH AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE CHECKED THE FORWARD ENTRY DOOR AND FOUND THE DOOR TO BE FALSELY LOCKED. CYCLED DOOR SEVERAL TIMES. DOOR OPERATIONAL CHECK GOOD. (M)