What was found
DURING SHORT FLIGHT, JUST AFTER LEVELING OFF AT 12,000', AMBER EFIS MISCOMPARE AND ALT FLAG (ON PFD2) DISPLAYED. THE RIGHT, PFD2 DISPLAYED A 140' LOW DIFFERENCE COMPARED TO THE LEFT PFD1. BOTH MESSAGES DISAPPEARED ONCE WE STARTED OUR DESCENT. QRH PROCEDURE WAS COMPLETED. REPEAT WRITE UP. REMOVED FAULTY ADC 2 AND REPLACED WITH REPAIRED ADC 2 TESTED TO 55,000FT ON 14JUN26 BY ROCKWELL COLLINS UNDER WORK ORDER 5800839075. PERFORMED FUNCTIONAL TEST OF AIR DATA COMPUTER WITH SATISFACTORY RESULTS. ALL PARAMETERS WITHIN AMM LIMITS. MAINTENANCE PERFORMED IN REFERENCE TO CL350 AMM 34-13-01. NO FURTHER ACTION IS REQUIRED CURRENTLY. DPS 1000 AOG054 CAL DUE 24OCT26.