What was found
DURING CRUISE, HAD A EICAS MESSAGES FOR HYD PRESSURE, SYS 3. PERFORMED QRH PROCED WITH NR 3 DMD ENG PUMPS OFF PRIOR TO PROCEDURE EICAS MESSAGES HYD PRESSURE NR 3 ENG, GPS, ADC CENTER MESSAGES. QRH/ ELC LIST COMPLETE BUT AURAL WARNING CONTINUED. NR 3 HYD SYS TEMP CONTINUNED TO RISE PEAKED AT 118 DEGREES. TEMP START REDUCING DURING DESCENT. HYD OVERHEATT SYS NR 3 EICAS MESSAGE, 1 HOUR AFTER BOTH DMD ENG PUMPS WERE TURNED OFF. TWO PAGES OF STATUS MESSAGES AT BLOCK IN. TESTED OK IAW AMM 34-58-00/501, AND 34-25-00/501. REPLACED WITH NEW HYD IM CARD ON THE NR 3 ENG POSITION IAW AMM 29-11-42 AND SYSTEM OPERATIONAL CHECKED OK.