What was found
LANDING GEAR HANDLE WOULD NOT RAISE GEAR AFTER TAKEOFF, LANDING INDICATING DOWN AND THREE GREEN, NO EICAS MESSAGE. DECLARED EMERGENCY AND RETURNED TO FIELD, LANDED WITHOUT INCIDENT. R & R NR 1 NLG WOW SENSOR AND WOW SENSOR HARNESS, PERFORMED MULTIPLE GEAR SWINGS IAW AMM 32-33-00, OPS CHECKED GOOD.