What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: CAPTAINS PRIMARY FLIGHT DISPLAY (PFD) FLASHED INTERMITTENTLY SHORTLY AFTER TAKEOFF. BOTH AMBER SPEED AND ALTITUDE DISPLAYED ON CAPTAINS PFD. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DEN. CAPTAIN'S (AOA)-ANGLE OF ATTACK SENSOR FAULTED, REMOVED AND REPLACED LEFT HAND AOA SENSOR (AALA202602186718), PER AMM 34-21-05. REMOVE AND REPLACED LEFT HAND PITOT AIR DATA MODULE (AALA202603061844) AND LEFT HAND STATIC AIR DATA MODULE (AALA202603064269), PER AMM 34-21-04. REMOVE AND REPLACED FLIGHT CONTROL COMPUTER-A (AALA202603068381), PER AMM 22-11-33. REMOVE AND REPLACED NUMBER 1 (ADIRU)-AIR DATA INERTIAL REF UNIT (AALA202603067992), PER AMM 34-21-01. ALL REQUIRED OPS CHECK AND TESTS ARE GOOD.