What was found
DURING GEAR RETRACTION, THE RIGHT MAIN GEAR WOULD NOT COME UP, THEN THE LEFT MAIN GEAR STARTED TO GO DOWN, THEN BACK UP. (FLT 5586) ADJUSTED LEFT MAIN GEAR UNLOCK PROX SENSOR POSITION SCREW AND ADJUSTED THE SEQUENCE VALVE AT LEFT MLG OUTBOARD GEAR DOOR PER EMB 120 MM.