As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER MOVING THE LANDING GEAR HANDLE (DOWN) AND SELECTING FLAPS (DOWN); THE HYDRAULIC PRESSURE GAUGE READ ZERO PSI. NO FLUID WAS VISIBLE IN THE HYDRAULIC RESERVOIR SIGHT TUBE. WITH BYPASS VALVE SELECTOR (UP) BRAKES OPERATED. HYDRAULIC LINE WAS REPAIRED.