What was found
LAX - NR 1 RUD HYD CAUTION LIGHT ILLUMINATED ON DESCENT INTO LAX. LANDING UNEVENTFUL. FERRY TO PDX FOR REPAIRS. PERFORMED WIRING CHECKS BETWEEN RUD 1 PUSH OFF SWITCH AND FCECU, NO DEFECTS WERE FOUND. CHECKED WIRING BETWEEN FCECU AND NR 1 RUDDER UNLOAD VALVE AND PCU FOR SHORTS TO SHIELD AND OTHER PINS USING MEGAOHMETER. NO SHORTS FOUND. CHECKED WIRING BETWEEN FCECU AND NR 1 RUDDER UNLOAD VALVE AND PCU FOR CONTINUITY USING DIGITAL VOM. FOUND HIGH RESISTANCE BETWEEN FCECU CONNECTOR 2700-P1 PIN 14 AND NR 1 RUDDER PCU CONNECTOR 2700-P5 PIN 1. ALL OTHER WIRES CHECK GOOD. REMOVED CONNECTOR 9811-P891 AND FOUND PIN V OF RECEPTACLE 9811-J891 NOT FULLY SEATED. PIN V WOULD NOT LOCK IN RECEPTACLE. REPLACED ELECTRICAL CONNECTOR 9811-J891 IAW DHC-8-400 WDGM 20-17-10. INSTALLED CONNECTOR 9811-P891. RESISTANCE CHECK NOW GOOD. RUDDER CONTROL SYSTEM AND RUDDER CONTROL SHUTOFF VALVES OPERATIONAL CHECK GOOD IAW DHC-8-400 MM TASKS NR'S 27-20-00-710-801 AND 27-20-00-710-802. ALL INDICATIONS NORMAL DURING TEST. RETURNED TO SERVICE.