As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO GET NORMAL LANDING GEAR EXTENSION. PERFORMED EMERGENCY LANDING GEAR EXTENSION. T/S LANDING GEAR SYSTEM INDICATED A MALFUNCTION OF THE LANDING EAR HYDRAULIC SELECTOR VALVE LOCATED IN THE MAIN WHEEL WELL. REPLACED LANDING GEAR HYDRAULIC SELECTOR/DUMP VALVE. LANDING GEAR OPERATIONAL CHECKS NORMAL IAW GULFSTREAM MM. (M)