What was found
LEFT MAIN GEAR RED UNSAFE LIGHT. PUT GEAR DOWN RECEIVED THREE GREEN AND LANDED. TOWER REPORTED TO THE CREW THAT THE ACFT HAS SOMETHING HANGING DOWN. TROUBLESHOT SYS, REMOVED THE LT MLG SEQUENCING VALVE, PN 48542-1, SN LK9702752, AND INSTALLED ON THE RT SIDE MLG. REMOVED THE RT MLG SEQUENCING VALVE AND INSTALLED ON THE LT SIDE. NO HELP. REMOVED THE LT NON-RETURN VALVE AND INSTALLED IN O/H NON-RETURN VALVE. OPERATED LANDING GEAR SYS SEVERAL TIMES. OPS NORMAL, NO LEAKS NOTED. WORK PERFORMED IAW MM 32-30-22.