As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN LANDING GEAR WAS EXTENDED WE GOT 3 GREEN AND 1 RED UNLOCKED LIGHT. AURAL WARNINGS CAME ON WHEN FLAPS FULLY EXTENDED AND WHEN TLA WAS BROUGHT TO IDLE. REMOVED RT MAIN LANDING GEAR DOWN LOCK SWITCH P/N 6-0407-1. INSTALLED AND RIGGED NEW DOWN LOCK SWITCH P/N 6-0407-1 IAW MM 32-30-04. PERFORMED GEAR SWINGS AND SEALED DOWN LOCK SWITCH. OPS CHECK GOOD, NO DEFECTS NOTED.