As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT HYDRAULIC QUANTITY DROPPING DURING TAXI. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE INSPECTED AIRCRAFT FOR HYDRAULIC LEAKS. NO EXTERNAL LEAKS NOTED. SUMPED FUEL FROM LH MAIN DUE TO RECENT MX. NO HYD FLUID NOTICED IN SAMPLE. RESERVICED HYD (LH) TO FULL. REF B767-2A/B. AC REMAINS NO ETOPS. AIRCRAFT RETURNED TO SERVICE.