As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON EXTENSION OF LANDING GEAR ENG 1 AND 2 HYD SYSTEMS LOW PRESSURE LIGHTS CAME ON. HYD PRESSURE A WENT TO ZERO AND HYD QUANT APPEARED TO GO TO ZERO. CHANGED BOTH CASE DRAIN FILTERS BOTH WERE CLEAN. OPERATED ALL FLT CONTROLS AND LANDING GEAR CYCLED WITH GEAR PINS INSTALLED, NO LEAKS. HYD QUANTITY WAS FULL. FOUND HYD HEAD PRESS AT ZERO. REPAIRED RSVR DRAIN TUBE. RAN ENGINES AND CHECKED PUMPS, ALL OK.