What was found
(CAN) NLG DOORS FAILED TO OPEN FOR NORMAL GEAR EXTENSION. ACC CREW NO AMBER DOOR INDICATION WHILE GEAR WAS SELECTED DOWN, ONLY RED INDICATION FOR NLG WAS SHOWN. INDICATION AND SEQUENCE OF MLG EXTENSION WAS NORMAL. ALTERNATE EXTENSION PERFORM BY PIC SUCESSFULLY. AS SOON AS NLG ALTERNATE RELEASE HANDLE WAS PULLED, DOORS OPENED IMMEDIATELY AND NLG EXTENDED WITHOUT PROBLEMS MAINTENANCE FOUND NLG DOOR ACTUATOR INTERNAL LEAKING.