What was found
SEA - L DOOR MLG REMAINED ILLUMINATED AFTER TAKEOFF. CONTINUED TO SEA PERFORMED ALTERNATE EXTENSION. LANDING UNEVENTFUL. TOWED OFF TAXIWAY. PERFORMED GVI OF LT MLG DOOR LINKAGE, NO DEFECTS NOTED. REMOVED AND REINSTALLED SAME SOLENOID SEQUENCE VALVE ON THE LT MLG IAW AMM TASK 32-31-41-000-801 AND 32-31-41-400-801 AND THE OPS TEST OF LANDING GEAR EXT AND RETRACTION SYSTEM OPS TEST GOOD IAW AMM TASK 32-31-00-710-801. NO DEFECTS NOTED. NO LEAKS NOTED. OPERATIONAL CHECK FLIGHT OK. RETURNED TO SERVICE. NO PARTS REPLACED.