What was found
NOSE DROPPED AFTER GEAR HANDLED MOVED FROM UP TO OFF. CREW ADVISED -FOLLOWED QRH. CYCLED THE GEAR BACK UP AND GEAR HANDLE REMAINS IN THE UP POSITION. ALL INDICATIONS NORMAL AND NLG REMAINED UP. ON DEBRIEF OF PILOT, ENTIRE NLG DROPPED NOT JUST THE NOSE OF ACFT. BOTH NLG TIRES WERE REPLACED IN BNA DURING A RON 3/14-3/15. FO ALSO REPORTED HAVING DIFFICULTY OPERATING GEAR HANDLE & HAD TO APPY ADDITIONAL FORCE WHEN USING THE TRIGGER. VERIFIED NLG CONTROL CABLES LGVA AND LGVB HAVE CORRECT TENSIONS AND RIG PIN LGE-1 IS A SLIP FIT IN LANDING GEAR SELECTOR VALVE WITH LANDING GEAR HANDLE IN THE OFF POSITION IAW AMM 32-31-00-820-801. TROUBLESHOOTING CONTINUES. FOUND HYDRAULIC FLUID LEAKING FROM NLG LOCK ACTUATOR, INSTALLED PN 273A1201-1 NLG LOCK ACTUATOR REF AMM TASK 32-33-21-400-801.