What was found
AFTER TAKEOFF ON FLIGHT 3893 FROM BWI TO JFK RECEIVED GEAR DISAGREE WARNING AND HYD SYSTEM 3 LOW PRESSURE CAUTION MESSAGE. GEAR DID NOT COMPLETELY RETRACT AND HYDRAULIC PRESSURE RETURNED TO NORMAL. MESSAGE REMAINED OUT AND DID NOT REOCCUR. AIRCRAFT LANDED AT ORIGINAL PLANNED DESTINATION (JFK) WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. DEFERRED LANDING GEAR RETRACTION SYSTEM IAW MEL 32-30-01.