As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 8783, GTF - FCA AIR TURNBACK, MASTER CAUTION AND CARGO DOOR LIGHT ILLUMINATED AFTER TAKEOFF. AIRCRAFT RETURNED TO GTF WITHOUT INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE PERFORMED OPS CHECKS. DOOR CLOSING AND VENT DOOR OPS CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.