What was found
(CAN) CREW REPORTED THAT DURING CRUISE THEY EXPERIENCED UNRELIABLE AIRSPEED INDICATIONS, ERRATIC INSTRUMENT INDICATIONS, A FAILED AUTOPILOT AND AN APPROXIMATE 400FT ALTITUDE DEVIATION. UNRELIABLE AIRSPEED/ALTITUDE WITH AP/AT FAIL AFCS FAULT & ADS PROBE 1 FAIL ON LANDING. FAULT CODES 27360006S1A, S2A,S1B,S2B PRESENT. T/S IAW FIM 27-36-00-810-904 THRU 907. ACFT POWER DOWN/ POWER UP SEQUENCE CARRIED OUT IAW AMM 24-42-02-860. FAULTS CLEARED NO PREVIOUS HISTORY IAW FIM CONSIDERED TRANSITORY CONDITION OF FLT. CONTROL SYSTEM, I/C CARRIED OUT.