As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING TO ALTITUDE THE LEFT GREEN INDICATOR LIGHT STARTED FLICKERING ON AND OFF. NO HYDRAULIC OR GEAR UNSAFE LIGHTS WERE PRESENT. AT FL300 IT CONTINUED TO FLICKER AND STYING ON LONGER AND LONGER, IT DID THIS FOR 1/2 HOUR. AT GEAR EXTENSION ALL GREEN LIGHTS. REMOVED LANDING GEAR PCB CARD. INSTALLED NEW PCB CARD. PERFORMED OPS ON LANDING GEAR WITH NO DEFECTS NOTED AT THIS TIME. WORK DONE IAW CITATION 560XLS MM CH 24-51-01