What was found
CID - FLT 4239 - DURING CLIMB CREW SELECTED GEAR UP AND RECIEVED LANDING GEAR AIR/GROUND AND LANDING GEAR MESSAGE ILLUMINATED ON EICAS. RIGHT MAIN LANDING GEAR DID NOT INDICATE UP AND LOCKED AND CREW REPORTED AIRCRAFT YAW WHILE PROBLEM WAS OCCURING. CREW RETURNED TO FIELD SAFELY WITH NO FURTHER INCIDENTS WERE OCCURRING. CREW RETURNED TO FIELD SAFELY WITH NO FURTHER INCIDENTS WERE REPORTED. REMOVED AND REPLACED LGEU IAW AMM. OPS CHECK GOOD. (M)