As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LOSS OF NR 1 HYD FLUID, LEFT SIDE. TROUBLESHOOTING REVEALED THE LEFT HYDRAULIC SYSTEM PRESSURE SWITCH IN THE TAIL COMPARTMENT FOR THE HYDRAULIC SYSTEM RUPTURED INTERNALLY CAUSING THE FLUID/PRESSURE LOSS. REPLACED THE LEFT HYDRAULIC SYSTEM PRESSURE SWITCH WITH A NEW TYPE, IMPROVED UNIT. ALL SWITCHES AND BOTH HYDRAULIC PUMPS WERE ALSO CHANGED PER FALCON RECOMMENDATIONS. SUBSEQUENT OPERATIONAL AND LEAK CHECKS WERE CARRIED OUT. AIRCRAFT RETURNED TO SERVICE.