As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK - ON TAKEOFF CAPT'S AIRSPEED STAGNATED AT 80 KTS, DECREASED THEN INCREASE WITH ALTITUDE. AIRSPEED UNRELIABLE - CHECKLIST ACCOMPLISHED. CAPC 1 DETERMINED TO BE FAULTY.REMOVED AND REPLACED #1 AIR DATA COMPUTER PER MM 34-16-01-401. OPS CHECK NORMAL PER MM 34-16-01-501 IPC 34-16-01-01 ITEM 055.