As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR EXTENSION, HAD A HYDR FROM CWP, MAIN HYDRAULIC PRESSURE DECREASED TO ZERO AND HYDRAULIC QUANTITY DECREASED TO ZERO. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LEFT MAIN LANDING GEAR ACTUATOR. BLED AND SERVICED HYD SYSTEMS IAW SAAB 340 AMM CHAP 32 AND 12. ALL CHECKS GOOD.