What was found
(CAN) AFTER TAKE-OFF "RUD PRES" & "RUD FULL PRESS" CAUTION LIGHTS ILLUMINATED, AIRCRAFT RETURNED FOR NORMAL LANDING , GROUND SYSTEM FUNCTION CHECK CARRIED OUT, NO FAULTS FOUND. A/C RETURNED TO SERVICE, NEXT DEPARTURE SAME CAUTION LIGHTS ILLUMINATED, AIRCRAFT RETURNED FOR NORMAL LANDING, GRD TESTS CARRIED OUT SERVICEABLE, BOTH RUDDER PRESSURE SWITCHES REPLACED, AIRCRAFT RETURNED TO SERVICE, NORMAL OPERATIONS.