What was found
ON FLT NR 2414, AT FL250 TEMP 30 DEGREES RECEIVED ELEVATOR FEEL, PITCH TRIM, SPOILER O/B, RUD CONTROL CAUTION LIGHTS AND IAS MISMATCH MESSAGES. SLOW TO 200 KTS. COMPLETED CHECKLIST FOR -IAS- MISMATCH (PDF), UNAFFECTED SIDE WAS NR 2. SEA - BIL FLIGHT DIVERTED TO GEG. MAINTENANCE COMPLIED WITH CLEANING OF THE PITOT AND STATIC LINES. COMPLIED WITH OPERATIONAL TEST OF AIR DATA SYSTEM. COMPLIED WITH PITOT/STATIC LEAK CHECK. SYSTEM OPERATES NORMALLY. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.