What was found
AIRCRAFT WAS GROUNDED: CANNOT OPEN FLIGHT DECK DOOR MANUALLY, ONLY WHEN USING "UNLOCK"ON THE COCKPIT DOOR SWITCH ON CENTER CONSUL ( WORKS FINE ON GROUND,BUT NOT AIRBORNE). REPLACED CENTER FLIGHT DECK DOOR RELEASE STRIKER, ADJUSTED FLIGHT DECK DOOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 52-51-12 AND 52-51-00.