What was found
GEAR HANDLE SELECTED DOWN, GREEN LIGHTS INDICATED 3 RED AND GEAR HANDLE REMAINED ILLUMINATED. PERFORMED MISSED APPROACH AND GEAR RETRACTED NORMALLY. ATTEMPTED SECOND NORMAL EXTENSION WITH SAME RESULTS, 3 RED AND GEAR HANDLE ILLUMINATED. PERFORMED ALTERNATE GEAR EXTENSION RESULTING IN GOOD GEAR EXTENSION AND LOCKED. LANDING UNEVENTFUL. INITIALLY UNABLE TO DUPLICATE, AS PRECAUTION R & R LG CONTROL PANEL IAW AMM 32-31-01-000-801 AND 32-31-01-400-801. DURING LG FUNCTIONAL TEST, DISCREPENCY DUPLICATED. PERFORMED RESISTANCE CHECK OF SELECTOR VALVE SOLENOIDS FOUND EXTEND SIDE OPEN. R & R LG SELECTOR VALVE IAW AMM 32-31-06-000-801 AND 32-31-06-400-801. OPS CHECKED GOOD. RETURNED TO SERVICE.