As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLYING EGE TO DEN, CREW REPORTED AFTER ROTATION A MASTER CAUTION LIGHT CAME ON WITH AFT CARGO DOOR SHOWING OPEN. CREW DID NOT DECLARE AN EMERGENCY AND RETURNED TO EGE WITHOUT INCIDENT. MAINTENANCE FOUND THE AFT CARGO DOOR LATCH IN THE UNLATCHED POSITION, LATCHED DOOR AND CONFIRMED DOOR SHUT AND LOCKED PER BOMBA AMM. OPS CHECKED GOOD.