What was found
DURING FLIGHT, CREW REPORTED THAT THE LANDING GEAR HANDLE DID NOT MOVE AND RECEIVED A LDG WOW SYS FAIL MESSAGE. AN EMERGENCY WAS DECLARED AND CREW RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, ADJUSTED BOTH NLG WOW SENSORS AND PERFORMED GEAR SWINGS PER EMB AMM AND OPS CHECKED GOOD.