What was found
AT CRUISE FLIGHT MULTIPLE AMBER ANNUNCIATIONS ILLUMINATED, AOA PROBE, FLAP SPEEDBRAKE AND STALL WARNING, OFF FLAGS ALSO CAME INTO VIEW ON THE AOA INDICATOR AND BOTH FAST/SLOW INDICATORS. CREW FOLLOWED AFM PROCEDURES AND A SAFE LANDING WAS MADE AT DESTINATION AIRPORT. INVESTIGATION REVEALED THAT THE ANGLE OF ATTACK COMPUTER HAD FAILED. THE COMPUTER WAS REPLACED WITH AN O/H UNIT AND ALL SYSTEM CHECKS WERE NORMAL. TIME 13 YEARS AND 2936 HRS SINCE LAST INSTALLATION AND FATIGUE ARE SUSPECTED CAUSES OF FAILURE.