What was found
AFTER DEPARTURE, LEFT MLG DID NOT APPEAR TO CYCLE FROM GREEN TO NORMAL UP INDICATION. PILOT ADVISED RESELECTED LANDING GEAR LEVER TO DOWN IAW ABNORMAL CHECKLIST AND GEAR SHOWED 3 DOWN AND LOCKED INDICATION. ACFT DECLARED AN EMERGENCY AND CONTROL TOWER REPORTED THAT LANDING GEAR ALL APPEARED DOWN - NORMAL. FLIGHT LANDED WITHOUT FUTHER INCIDENT. MX TROUBLESHOT ACFT AND FOUND LT MLG ACTUATOR HAD FAILED INTERNALLY. R & R LT MLG ACTUATOR AND PERFORMED GEAR SWINGS IAW AMM 32-30-06 AND 32-30-00. ALL OPS CHECKED GOOD. NO FURTHER DEFECTS NOTED.