What was found
MLG DID NOT COME DOWN WHEN SELECTED. CAS MESSAGE GEAR DISAGREE. AFTER RUNNING CHECKLIST ALL 3 GEAR CAME DOWN & GOT 3 GREEN. MANUALLY RESET & SAFETIED CONTROL ARM ON EMERGENCY GEAR EXTENSION BOTTLE IAW AMM REF 12-10-45. RESET PNEUMATIC OVERRIDE VALVE IAW AMM 12-10-45. OPS MLG MULTIPLE TIMES TO RELEASE NITROGEN FROM HYDC SYS & OPS CHECK MLG LEVER, REFER TO STEP 3.2 SING OFF. BLED & SERVICED HYD SYS IAW 12-10-30. EMERGNECY GEAR EXTENSION BOTTLE REQUIRES SERVICING, REMOVED FAILED LANDING GEAR MODULE & INSTALLED OVERHAULED UNIT IAW AMM 32-30-30, CONNECTED EXTERNAL HYD POWER IAW AMM 29-00-00. PERFORMED LANDING GEAR OPERATIONAL CHECK MULTIPLE TIMES. OPS CHECKS GOOD. NO DEFECTS NOTED.