As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, THE GEAR HANDLE WAS SELECTED DOWN. THE 3 GEAR DOWN GREEN LIGHTS ILLUMINATED AND THE 3 RED UNSAFE LIGHTS ALSO ILLUMINATED ON BOTH THE FORWARD AND OVERHEAD PANELS. ACFT CARRIED OUT A GO-AROUND AND ON SECOND APPROACH WHEN THE GEAR WAS SELECTED DOWN INDICATION WAS NORMAL. IN REF TO FLEET TEAM DIGEST 737- 32-06009 THE LANDING GEAR HANDLE WAS CLEANED IAW ITEM 5 OF THE OPERATOR ACTION. THE HANDLE WAS THEN FUNCTION CHECKED 10 TIMES AND INDICATION WAS NORMAL.