What was found
ON T/O AT ORD , NADPI T/O, ENGAGE PROF AT 500' AGL AT 1000' AGL NO PROF/GA THRUST AND SPEED SAW IT V2 PLUS 10 APPROX 165 KTS, PULLED LEVEL CHANGE. TRIED TO ENGAGE A/P BOUTIED 250 KTS AT 3000' A/C LEVELED AT 5000'. THEN STARTED DESCENT WHILE ACCELERATING.PF USES U/S TO GET A/C BACK TO 5000' MSC. AP AID PROF AN FMS SPEED WORK FINE AT CRUISE. AT 250 KTS, GOT SLIGHTLY JUST (260) AND GOT A SLAT OVERSPEED WARNING BUT SLATS WERE RETRACTED AND THE TOP FOOT ABOVE 300 KTS. DURING APPROACH AT APPROX 2000' AGL FLAPS 15/ GEAR EXT/ ATS OFF THE AFS WENT TO G/A MODE PITCH UP. DISENGAGE AP. COULD NO GET SYSTEM OUT OF G/A MODE FLEW A/P/ATS OFF WITH RAW DATA NO SPEED BALL. THROTTLE MODULE REMOVED AND REPLACED "GO-AROUND" SWICTH THEN REINSTALLED. PERFORMED R-T-S OF FCC1 & FCC2 PER M/M 22-00-00-5, ALL TESTS PASS, A/C OK FOR SERVICE.