As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE, THE CREW RECEIVED A MAIN CABIN DOOR OPEN INDICATION. THE CREW DIVERTED TO CLT AND THE INDICATION WENT OUT ON DESCENT. NO EMERGENCY WAS DECLARED AND FLIGHT 4120 LANDED WITH NO FURTHER INCIDENTS. OUTSTATION MAINTENANCE INSPECTED AND FOUND NO DISCREPANCIES. WHEN FLIGHT 4120 ARRIVED IN PIT WITH NO FURTHER INCIDENTS. MAINTENANCE COMPLIED WITH AN OUTSTATION INSPECTION AND INSPECTED AND PERFORMED OPERATIONAL CHECKS WHICH WERE GOOD. THE AIRCRAFT WAS AGAIN RELEASED FOR SERVICE.