What was found
NLG LANDING GEAR EXTENSION: WHEN LANDING GEAR WAS SELECTED DOWN, NLG DID NOT EXTEND & RECEIVED GEAR DISAGREE N CAS MESSAGE. RECYCLED MLG & NLG INITIALLY DID NOT EXTEND NORMAL & RECEIVED CAS MESSAGE AGAIN. ABOUT TO EXECUTE MISSED APPROACH, WHEN NLG EXTENDED & RECEIVED DOWN & LOCKED GREEN LIGHT. JACKED AIRCRAFT IAW MM 07-10-10. REMOVED FAULTY NLG EXTENSION/RETRACTION ACTUATOR & INSTALLED SERVICEABLE ACTUATOR IAW MM 32-30-05. PERFORMED NLG CASTER ADJUST IAW MM 32-00-00. NOTED CASTER GOOD AT 90 DEG. PERFORMED MLG CLEARANCE CHECK IAW MM 32-00-00. PERFORMED MLG OPS CHECK IAW MM 32-00-00. PERFORMED BLEEDING & SERVICING OF HYD SYS IAW MM 12-10-30. OPS & LEAK CHECKED GOOD.