What was found
1 HOUR AFTER TAKEOFF, AT FL300 RECEIVED HYD PRESS 3 LOW LEVEL 1 ALERT, NR 3 HYD PRESSURE INDICATED 0 & NR 3 HYD QTY INDICATED 10.9 GALS, TURNED ON BOTH RMPS, NO HELP NR 3 PRESSURE STILL 0. DURING LANDING PHASE-RECEIVED HYD 3 PRESS LOW & HYD NR 3 FAIL LEVEL 2 ALERTS, PERFORMED ALT GEAR EXT & LANDED WITHOUT INCIDENT. OPS ALL FLIGHT SURFACE WITH SATISFACTORY ONLY HYD NR 3 SYS ON, CONFIRMED INDICATION PROBLEM, MX PROCEDURE C/W. R & R NR3 HYD SYS PRESS TRANDUCER IAW MM 29-12-46-2 OPS AND LEAK OK.