What was found
(CAN) : (FLT NOSK1868 - DEPARTING STAVANGER AT 1225 TO COPENHAGEN). PILOTS RPT IN A/C TECH LOG (L528) STATES:AT FL160 IAS MISMATCH APPEARED. DISAGREEMENT BETWEEN ALL INSTRUMENTS & STANDBY INSTRUMENTS. LOT OF LIGHTS CAME ON CAUTION WARN PANEL. SOME OF THESE WERE PITCH TRIM, ELEV FEEL, SOME SPOILER LIGHTS, NR1 STALL SYS FAIL, & PUSHER SYS FAIL. AFTER APPROX. 8 MINS, MOST FAILURES CANCELED THEMSELVES EXCEPT FOR NR 1 STALL SYS FAIL & PUSHER SYS FAIL. DURING FAIL PERIOD, LT AIRSPEED & ALTIMETER FAILED COMPLETELY FOR APPROX 3-4 MINS. RUDDER CONTROL CAUTION LIGHT ALSO CAME ON DURING FAILURE PERIOD. LT AIRSPEED WENT TO 30, RT AIRSPEED 230 IAS, STANDBY160 IAS.MAINT: TROUBLESHOOTING FOUND WATER CONTA