What was found
AFTER TAKE OFF LG LEVER DISAGREE CAS MESSAGE WAS DISPLAYED. RECYCLED THE LANDING GEAR AS PER THE QRH. IT SHOWS 3 GREEN ON EXTENSION. ON RETRACTION INDICATES A NOSE LANDING MALFUNCTION. LANDING GEAR GRAVITY EXTENSION WAS PERFORMED AS PER PROCEDURE. PLACED AIRCRAFT ON JACKS. REMOVED AND REPLACED THE NLG SHOCK STRUT ASSEMBLY AS REQUIRED. COMPLIED WITH A FINAL SERVICING OF THE STRUT AFTER FINAL INSTALLATION OF THE ASSEMBLY. COMPLIED WITH FUNCTIONAL CHECKS OF LANDING GEAR EXTENSION AND RETRACTION/OPS CHECKS AS REQUIRED, NO FURTHER DEFECTS NOTED AT THIS TIME. ALL WORK COMPLETED IN REFERENCE WITH EMBRAER PHENOM 300 MAINTENANCE MANUAL CHAPTER 32-21-01, 29-10-00.