What was found
FLIGHT 7202 EN-ROUTE, DISCREPANCY. ONCE AIRBORNE, AFTER TAKEOFF, THE NR 2 EADI STARTED SHOWING PITCH & ATTITUDE CAUTIONS. THE CREW ELECTED TO RETURN, NO EMER WAS DECLARED. REPLACED THE NR 2 AHRU. OPERATIONS CHECKED GOOD. ACFT RETURNED TO SERVICE.