As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5288 - DURING CLIMBOUT OF BOS RECEIVED A CARGO DOOR CAUTION MESSAGE, FLIGHT RETURNED TO THE FIELD. FOUND CARGO STRAP WEDGED BETWEEN DOOR AND FRAME, REPOSITIONED CARGO STRAP, PERFORMED AN OPERATIONAL CHECK OF CARGO DOOR, NO DISCREPANCIES NOTED.