What was found
ON SHORT FINAL, GEAR SELECTED DOWN, DID NOT RECEIVE GEAR LOCKED INDICATION LIGHT. RECYCLED GEAR LEVER AND GEAR LOCKED. HEARD GURGLING SOUND FROM CENTER CONSOLE. FIRST OFFICER'S PFD AND ND WENT BLANK AND THEN CAME BACK UP WITH NO PILOT ACTION. *S/D* COULD NOT DUPLICATE PROBLEM ON GROUND. REPLACED GEAR DOOR SENSOR 38GA AND LANDING GEAR SELECTOR VALVE PRECAUTIONARY, SYSTEM CHECKED NORMAL.