What was found
AIRCRAFT WAS GROUNDED: AT FL340 ATC SHOWED OUR AIRCRAFT 400 FT HIGH. ALTITUDE SELECTOR WINDOW FL340. 1 - 33900, STBY - 34020, 2 - 34070. TAT-21 SAT-47265 KTS. DESCENT TO 33700 PUT US LEVEL WITH OTHER AIRCRAFT. REMOVED AND REPLACED RIGHT AOA PER AMM 34-11-19.