What was found
NOSE LANDING GEAR FAILED TO INDICATE DOWN & LOCKED AFTER NORMAL & ALTERNATE EXTENSIONS. DURING EVENT, LOSS OF LT HYD PRESSURE & VOLUME WHICH EVENTUALLY RESTORED TO NORMAL. AFTER LANDING, GEAR OVER CENTER WAS NOT FULLY IN POSITION. HAD TO BE MANUALLY FORCE IT INTO POSITION IN ORDER TO INSERT PIN. FOUND FWD BOLT OF THE NLG SEIZED. REPLACED NLG DOWN LOCK ACTUATOR. INSTALLED WITH NEW HARDWARE IAW AMM 32-38-07. OPERATIONS CHECKED GOOD IAW CMP G450 323900 LANDING GEAR FUNCTIONAL TEST.