As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR FAILED TO EXTEND FOR LANDING. EMERGENCY EXTENSION PROCEDURES FAILED, AIRCRAFT MADE GEAR UP LANDING. INSPECTION REVEALED THE LEFT GREEN HYD SYSTEM RESERVOIR WAS EMPTY. FOUND LEFT ENGINE DRIVEN HYD PUMP PRESSURE HOSE CHAFED THROUGH CAUSING HYD FLUID LEAKAGE. SUSPECT PRESSURE HOSE WAS CHAFED AGAINST THE LEFT OTBD COWLING DOOR SUPPORT ROD HOLDER.