What was found
ADC MECHANICAL ISSUE, FLIGHT DIVERTED. CREW REPORTED AT FL370 FIRST OFFICER'S AIR DATA FLAGS IN VIEW AND THE RUDDER RATIO FAILED. SWITCHED TO FIRST OFFICERS ON STBY AND REGAINED AIR DATA INFO BUT THE RUDDER RATIO IS INOPERATIVE. RT ADC FAIL INDICATOR IN VIEW ON ARRIVAL. TEST 30 CURRENT FAULTS INDICATED RT ADC FAILURE. REPLACED RT ADC PER MM AND ACCOMPLISHED CURRENT FAULT TEST PER MM. NO CURRENT FAULTS NOTED. ACCOMPLISHED RUDDER RATIO CHECKS PER MM, ALL INDICATIONS NORMAL.