As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXIING ONTO RUNWAY SYSTEM A HYDRAULIC PRESSURE WAS LOST. AIRCRAFT WAS TOWED TO GATE. THE NR 6 SLAT ACTUATOR WAS FOUND WITH THE FLANGE NUT FITTING CRACKED IN HALF. REPLACED THE SLAT ACTUATOR AND THE NR 1/ NR 2 ENGINE DRIVEN HYDRAULIC PUMP AND CASE DRAIN FILTERS. CHECKED FOR LEAKS AND FOUND OK. (M)