What was found
AFTER TAKEOFF, BOTH PRIMARY (LIGHT BY HANDLE) AND SECONDARY (SYNOPTIC) SHOWED UNSAFE FOR LEFT MAIN LANDING GEAR WITH GEAR HANDLE UP. CYCLED GEAR, NO HELP. INDICATIONS OK WITH HANDLE DOWN. DUMPED FUEL, RETURNED FOR NORMAL LANDING. REMOVED AND REPLACED LEFT GEAR BRAKE LINE BRACKET SUPPORT ASSY, BOGIE BEAM TRIM ACTUATOR OPS CHECKED IAW MM, OPS NORMAL. PERFORMED OPS EXTENSION RETRACTION TEST ON LEFT MAIN LANDING GEAR IAW MM. OPS, NORMAL. PERFORMED ANTISKID CONTROL UNIT TEST IAW MM. ALL TEST PASS.