As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PVD/IAD - FLT 7531 - DURING TAKEOFF, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO UNABLE TO PRESSURIZE AIRCRAFT. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND FOUND PASSENGER DOOR SEAL MIS-POSITIONED. MAINTENANCE RE-POSITIONED SEAL. OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)