What was found
NR 1 SYS-A HYDRAULIC PRESSURE LIGHT ILLUMINATED DURING TAKEOFF ROLL. WHEN GEAR LEVER WAS POSITIONED TO UP NR 2 SYS-A LIGHT ILLUMINATED AND HYDRAULIC QUANTITY RAPIDLY FELL TO 0 GALLONS. PRESSURE DROPPED TO 0 PSI. ACCOMPLISHED APPROPRIATE ABNORMAL PROCEDURES. FOUND NR 1 SLAT ACTUATOR LEAKING. ACTUATOR ARM BLOWN OUT, SEAL RUPTURED. REMOVED AND REPLACED NR 1 SLAT ACTUATOR PER MAINTENANCE MAN UAL 27-81-32 PAGE 401 TO 406. OPERATIONAL CHECK AND LEAK CHECK GOOD HYDRAULIC SYSTEMS SERVICED.