What was found
ON FLIGHT 3529 THE CREW REPORTED THEY WERE UNABLE TO ENGAGE AN LATERAL FLT DIR MODE ROLL, HDG, NAV VSI & SPD MODES WORKED INTERMITTENTLY AL HOLD WORKED. THE CREW ELECTED TO RETURN TO MIA. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. RE-SECURED PUSH BUTTONS ON SWITCHES ROLL, HOG , NAV, VSI, SPD IAW AMM 22-10-00. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.