As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BAGGAGE DOOR: ON CLIMB OUT THROUGH 10000FT THE CARGO DOOR ANNUNCIATOR ILLUMINATED. WE STOPPED THE CLIMB AND DESCENDED BACK TO 10000FT AND THE LIGHT EXTINGUISHED. WE THEN FELT THE CABIN ALTITUDE CLIMBING FOLLOWED BY THE RED CABIN ALT ANNUNCIATOR. WE RETURNED TO FLL WITHOUT FURTHER INCIDENT, BUT DID INSPECT THE CARGO DOOR AFTER LANDING AND DID NOT NOTICE ANYTHING UNUSUAL. REMOVED AND REPLACED LGECU.