What was found
AT FL400 AIRSPEED AND ALTITUDE INDICATIONS BEGAN TO FLUCTUATE AND DISAGREE FLAG. DETERMINED CA SIDE WAS UNRELIABLE/BAD. FO SIDE RELIABLE AND STANDBY RELIABLE. INTERMITTENT ON DESCENT AND ARRIVAL.<[01] R AND R LEFT STATIC AIR DATA MODULE PER AMM 34-21-04. REQUIRES OPERATIONAL TEST;[02] SIGNED IN ERROR;[03] PERFORMED ADIRU BITE; FOUND FAULT CODES 31-65050 & 31-65060. PERFORMED FIM TASK 61-62 TASK 876. R/R CAPT PITOT PROBE REF ?TTGQ00RXGS1?. R/R CAPT STATIC ADM REF?TTG00RXG3N?. REF LOG PAGE 2738310 FOR CAT III RECERTIFICATION