What was found
ON FINAL INTO KCAE, WHEN CALLED FOR GEAR DOWN, SELECTED LEVER DOWN WITH NO LOWERING OF GEAR. HAD 3 RED LIGHTS BUT NO EXTENSION. MANUALLY LOWERED GEAR IAW QRH & HAD SUCCESSFUL GEAR EXTENSION. REVERSED MEL 32-30-01-B. VERIFIED FREE FALL VALVE WAS CLOSED & AT STOP. JACKED ACFT IAW AMM 07-11-00-00. PERFORMED INSP CHECK OF GEAR RETRACTON - EXTENSION, FAILS ON EXTENSION. CHECKED WIRING FROM 3GA - 2GA (E - F FOR 28V) CHECKS GOOD. CHECKED COILS ON OLD MGL SELECTOR VALVE, FOUND C - B OPEN, E - F ONLY READING 4 OHMS, CHECKS BAD. REMOVED & REPLACED MLG SELECTOR VALVE 3GA PER AMM 32-31-12-04. PERFORMED 10 TOTAL GEAR SWINGS, 5 IN SYS 1 AND 5 IN SYS 2, LEAK & OPS CHECKED GOOD.