As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHAFT SHEARED ON NR1 (L) HYD PUMP WHILE ACFT WAS IN A CLIMB AFTER TAKE OFF. THIS RESULTED IN THE HYD RESERVOIR TO BE EMPTIED OVERBOARD THRU THE PUMP DRAIN. THE PILOT'S THEN GOT A HYD FLOW LOW ANNUNCIATOR, FIRST ON THE RT SIDE AND THEN A FEW SECONDS LATER ON THE LT. PERFORMED AN EMERGENCY EXTENSION OF THE LANDING GEAR AND RETURNED TO THE DEPARTURE AIRPORT.