As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
15 MINUTES AFTER DEPARTURE, CREW RECEIVED “L THRUST REVERSER MAINT” AMBER CAS MESSAGE AND ON FLIGHT CONTROL SYNOPTIC AN AMBER DEPLOYED THRUST REVERSER INDICATION. CREW DID NOT HAVE ANY CONDITIONS ASSOCIATED WITH A DEPLOYED TR, HOWEVER DECIDED TO RESPOND AS IF TR WAS DEPLOYED. CHECKLIST FOLLOWED, EMERGENCY DECLARED, AND UNSCHEDULED UNEVENTFUL LANDING PERFORMED. MAINTENANCE EVALUATION FOUND LEFT TR UPPER STOW SWITCH BAD. LEFT TR UPPER STOW SWITCH REPLACED P/N OFF T7013 S/N OFF 1759 AND SYSTEM OPS CHECK GOOD.