As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH; IAS DISAGREE AND ALTITUDE DISAGREE WARNINGS. CAPTAIN IAS 40 KTS SLOW; CA ALTIMETER 500' LOW. F/O AND STANDBY INSTRUMENTS ACCURATE. REF FIM 34-61-00 BITE CHECKED ADIRUS AND FOUND LEFT ADIRU FAULTING. R&R LEFT ADIRU PER AMM34-21-01. REF LOG PAGE 0279303E FOR FINAL ACTION. AIRCRAFT DOWNGRADED TO CAT 1, REF TTG8Q00GZRWJ.