What was found
AC 211GL, AIR RETURN FLT NR 5066 "GBD" 06/27/08. PILOTS REPORTED THAT AFTER GEAR RETRACTION, THE GEAR WOULD NOT RETRACT. APPROXIMATE SPEED AT THE TIME WAS 106 KTS. "3" GREEN LIGHTS, NO RED GEAR UNSAFE LIGHTS. MAINTENANCE REMOVED AND REPLACED SERVICE VALVE IAW MM32-30. MAINTENANCE ALSO REPLACED THE RT MLG SQUAT SWITCH AND RIGGED IAW MM 32-60. OPS CHECK OF GEAR WAS GOOD. (K)