As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI WITH FLAPS EXTENDED "A" HYD SYS QUANTITY DECREASED TO 1.9 GALLONS, ON RETURN TAXI QUANTITY INCREASED TO 2.4 GALS WITH FLAPS RETRACTED. C/W A VISUAL INSP OF THE WING FLAP SYS (NO EXTERNAL LEAKS NOTED) FOUND RESERVOIR QUANTITY LOW. SERVICED RESERVOIR.