As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOTS OF FLIGHT 2434, DCA TO YYZ, REPORTED A PASSENGER DOOR OUTER HANDLE CAUTION MESSAGE ON THE EICAS PRIMARY DISPLAY. THE AIRCRAFT DIVERTED TO PIT AND MADE AN UNEVENTFUL LANDING. PSA MAINTENANCE TROUBLESHOT THE PASSENGER DOOR SYSTEM IAW CRJ200 FIM 52-70-04. NO DEFECTS WERE FOUND. THE DOOR OPERATIONALLY TESTED GOOD IAW CRJ200 AMM 52-70-04-710-801. THE AIRCRAFT WAS THEN RETURNED TO SERVICE.