As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1221 - CVG-MKE - DURING CLIMB-OUT, THE CARGO DOOR ANNUNCIATOR ILLUMINATED. THE CREW MADE AN AIR-TURN-BACK AND AN UNEVENTFUL LANDING IN CVG. THE CREW CONTACTED MX AND PUT THE ANNUNCIATOR ON MEL. MAINTENANCE READJUSTED THE BOTTOM ROLLER SWITCH ON THE CARGO DOOR, OPS CHECKED IT AND RETURNED THE AIRCRAFT TO SERVICE. (M)