As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN RETRACTING THE LANDING GEAR AFTER TAKEOFF, BOTH HYD LIGHTS ILLUMINATED AND HYD PRESSURE DROPPED TO ZERO. RETURN FOR LANDING. AFTER EMERGENCY GEAR EXTENSION, FOUND THE HYD ACCUMULATOR CRACKED. REPLACED ACCUMULATOR. SERVICED SYSTEM. RAN LT AND RT ENGINES, BLED AND RESERVICED. OPS AND LEAK CK GOOD.