As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5247- ON CLIMB-OUT FROM JAN TO CVG A/C FAILED TO PRESSURIZE. EMERGENCY DECLARED, A/C RETURNED TO JAN AND LANDED SAFELY. INSPECTED A/C AND FOUND FWD TOP ROLLER ON CARGO DOOR OUT OF TRACK. REINSTALLED ROLLER IN TRACK. OPS CHECK GOOD.