What was found
ON CLIMB-OUT FROM BOS, EN ROUTE TO DCA, CREW RECEIVED A RIGHT MLG UNSAFE INDICATION WITH GEAR UP AND LOCKED. FLIGHT RETURNED TO FIEDL AT BOS AND LANDED WITHOUT FURTHER INCIDENT. CREW REPORTED RECEIVING A NORMAL GEAR INDICATION OF THREE GREEN LIGHTS WHEN EXTENDING THE GEAR. NO EMERGENCY WAS DECLARED. MAINTENANCE SWUNG THE GEAR AND WAS UNABLE TO DUPLICATE THE PROBLEM. REMOVED AND REPLACED THE M982 ANDM986 PRINTED CIRCUIT CARDS, AS PRECAUTIONARY. OPS CHECK GOOD. (M)