As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT, RIGHT HYD .89, AFTER ENGINE START W/ FLAPS EXTENDED TO 5 RIGHT QTY DROPPED TO .66 THEN .61 W/ RF SIGN AT SAME TIME CENTER. HYD INCREASED TO 1.30, DRAINED C HYD SYS REFILLED R SYS TO FULL RAN BOTH ENGS OPERATED BRAKES, FLAPS COULD NOT DUPLICATE PROBLEM. OK FOR SVC.