As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4034 THE CREW REPORTED THAT THE CARGO DOOR INDICATION REMAINED OPEN AND WOULD NOT INDICATE THAT IT WAS CLOSED. THE AIRCRAFT WAS REMOVED FROM SERVICE. CLEANED AND LUBED CARGO DOOR MICRO SWITCHES IAW EMB AMM 52 76 00. THE OPERATIONAL CHECK WAS GOOD. NO PARTS REMOVED OR REPLACED. THE AIRCRAFT WAS RETURNED TO SERVICE.