What was found
IN CRUISE FLIGHT HYD SYS 3 LOST FLUID SLOWLY HYD SYS 3 ELEV OF LIGHT ILLUM. USED HYD SYS LOW/LOSS/ELEV 3 LT CK LIST. CONTINUED TO LOSE FLUID TO EMPTY ON SYS 3. LANDED W/O SYS 3 LOWER YAW DAMP INOP LT CAME ON DURING THIS EVENT. PER CREW DEBRIEF NR 3 ENG HYD PUMPS SHUT OFF W/4 GALS HYD FLUID INDICATED, .75 GALS INDICATED IN NR 3 SYS WHEN A/C ARRIVED AT GATE. REMOVED AND REPLACED NR 1 AUX HYD PUMP PER M/M 29-21-01 P 201. SERVICED NR 3 HYDRAULIC RESERVOIR 08.0 GAL LK CK GOOD. REMOVED AND REPLACED NR 3 SYS RETURN AND NR 1 AUX PRESS FILTERS.