What was found
ON DEPARTURE FROM DTW ON FLIGHT 2787, A/P WOULD NOT ENGAGE. SHORTLY AFTER THE ROLL LIGHT ON BOTH EADI'S CAME ON WITH THE AVIONICS CAUTION LIGHT. THE FO'S EADI WAS SHOWING A RIGHT 7 DEGREE TURN WHEN STRAIGHT AND LEVEL AFTER LANDING FO'S EADI SHOWED A 3 DEGREE PITCH DOWN ATTITUDE. AIR RETURN TO DTW. MAINTENANCE COULD NOT DUPLICATED, REPLACED NR 1 AND NR 2 AHRS COMPUTER FOR PRECAUTION. P/N 622-6190-113, S/N ON 2982, S/N OFF 2964. ALL CHECKS GOOD AT THIS TIME.