What was found
"#1 RUD HYD" AND "RUD CTRL" CAUTIONS ILLUMINATED DURING CLIMB. THE RUD CTRL CAUTION WAS INTERMITTENT. RETURNED TO FIELD. LANDING UNEVENTFUL. REMOVED FROM SERVICE. FOUND THE FOLLOWING PRESENT FCECU FAULTS : 7E, 7C, 7A, 79, 78, 77, 76,75, 74, 72. CLEARED NVM OF FCECU, AND PRESSURIZED #1 AND #2 HYD SYSTEM, #1 RUD HYD CAUTION REMAINS ON AND THE FOLLOWING HARD FAILED FAULTS: FCECU FAILURE 6E, 6D, AND 6C. 98253 11/24/19. C/W Q400 FIM TASKS 27-21-26-810-801 AND 27-21-26-810-802 FOR FAULTS 6C AND 6D. CHECKED WIRING BETWEEN LOWER RUDDER PCU 2700-P3,P4,P5 AND FCECU 2700-P1, NO DEFECTS NOTED. REMOVED AND REPLACED FCECU AS A PRECAUTIONARY MEASURE IAW Q400 AMM 27-00-01-000-802/400-802, OP'S TESTS GOOD. C/W OP'S TEST OF RUDDER CONTROL SYSTEM IAW Q400 AMM 27-20-00-710-802, OP'S TEST GOOD. NO FAULTS OR CAUTIONS WERE NOTED. RETURNED TO SERVICE.