What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT DECK DOOR DIFFICULT TO OPEN. DOOR HANDLE WILL NOT OPEN DOOR WHEN TWISTED TO THE RIGHT.. TWISTING LEFT THE DOOR OPENS NORMAL. MAINTENANCE CHECKED AND FOUND SMALL FASTENER LODGED IN CENTER LATCH OF FLIGHT DECK DOOR, REMOVED FASTENER AND INSTALLED MISSING FASTENER IN UPPER FLIGHT DECK DOOR LATCH TRIM. A SATISFACTORY OPERATIONAL CHECK OF THE FLIGHT DECK DOOR WAS ACCOMPLISHED WITH NO ISSUES NOTED.