What was found
AIRCRAFT WAS GROUNDED. SJD-LAX AT LAX EMERGENCY WAS DECLARED ACCOUNT NOSE GEAR STEERING INDICATION. FLIGHT LANDED WITHOUT INCIDENT. ON LANDING GEAR EXTENSION, "LGCIU 1 AND 2 FAULT" APPEARED DURING APPROACH. GEAR DOORS STAYED OPEN, NO NOSE WHEEL STEERING DURING ROLLOUT AND AFTER LANDING. REPLACED LANDING GEAR SELECTOR VALVE PER AMM 32-31-12, LEAK CHECK GOOD. OPERATIONS TEST GOOD. PERFORM GEAR SWING PER AMM 32-31-00-720-001-A, CHECK GOOD. REPLACED NOSE WHEEL STEERING CONTROL PER AMM 32-51-51. OPERATIONS TEST AND LEAK CHECK GOOD. THIS SDR IS FOR LANDING GEAR SELECTOR VALVE. (SEE CONTROL #AALA201810309002)