As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT -A- SYSTEM DROPPED BELOW REQUIRED MINS. FOUND AIR TO BE IN SYSTEM FROM PREVIOUS HYDRAULIC LEAK. CYCLED ALL SYSTEMS NUMEROUS TIMES TO BLEED AIR AND SERVICED -A- HYDRAULIC SYSTEM IAW B727 MM CHAPTER 12-12-00 USING 2 GALLONS. NO LEAKS NOTED AT THIS TIME.