What was found
ACARS WOULD NOT INIT, APPROX 2 MIN AFTER TAKEOFF, THRUST LIMIT MISMATCH MSG ON MCDU. . CHECKED PERFORMED THRUST LIMITS & ENG THRUST ACTUAL STGS, ALL NORMAL. APPROX 12 MIN AFTER TAKEOFF AUTOPILOT DISCONNECT, ATS DISCONNECT & ALL FLIGHT GUIDANCE REMOVED FROM FCP & HUD. ACFT CONTROLLED MANUALLY & ON RAW DATA NORMALLY. DECLARED EMER & RETURNED. APPROX 10 MIN PRIOR TO LANDING AUTOPILOT 2, CAPABILITY RETURNED AUTOPILOT NR 1 STILL NO GO. ATS STILL UNABLE. LANDING ON 36C NORMAL LGWN 431.0 FLAPS 50'. FOUND FCC-1 INTERMITTENT TOT AIR TEMP INV FAULT. REPLACED TAT PROBE IAW AMM 34-16-02-2. CHECKED GOOD TAT OPERATIONS CHECKED NORMAL IAW AMM 34-16-02-2.