What was found
AT FL410 THERE WAS A LOUD THUMP IN THE NOSE GEAR AREA AND THE GEAR UNLOCK RED LIGHT ILLUMINATED, THERE WAS ANOTHER THUMP AND THE LIGHT EXTINGUISHED. LANDING GEAR BLOW DOWN HANDLE WAS PULLED. JACKED AIRCRAFT AND PERFORMED GEAR BLOW DOWN AND OPS CHECK, RESET GEAR BLOW DON AND SERVICED NITROGEN IAW 750 MM CHAPTER 12-00-01. FOUND NOSE GEAR UP LOCK RELEASE WAS HOLDING UP LOCK FROM FULLY ENGAGING ROLLER. RE-RIGGED NOSE GEAR RELEASE AND OPS CHECKED SYSTEM, OPERATIONAL CHECK OF SYSTEM GOOD. ALL WORK DONE IAW 750 MM CHAPTER 32-30-06.