What was found
LANDING GEAR WOULD NOT RETRACT, SYSTEM 2 CYCLE GEAR SAME RESULT. SWITCH TO SYSTEM 1, NO CHANGE AT FIRST, AFTER 2 OR 3 CYCLE ATTEMPS, GEAR RETRACTED. PERFORMED TROUBLESHOOTING IAW WIRING SHCEMATIC 32-31-00. SUSPECT SELECTOR VALVE MLG CONTROL OR SWITCH UNIT. R & R LANDING GEAR SELECTOR VALVE IAW MM 32-31-12-4, AND R & R LANDING GEAR CONTROL HANDLE SWITCH IAW MM 32-31-11-4 . PERFORMED GEAR SWINGS, NORMAL. OPS TESTED THREE TIMES ON EACH SYSTEM IAW MM 32-31-00-05-09, ALL GEAR RECTRACTED AND EXTENDED NORMALY ON BOTH SYSTEM. ALL OK, NO LEAKS FOUND ON SELECTOR VALVE DURING GEAR.