What was found
LT AND RT FADEC FAULTY EICAS MESSAGES CAME ON AT V1 (1 ST ONE) AND ABOUT 5 SECONDS LATER (2 ND ONE) ON TAKEOFF. ACFT WAS COLD SOAKED AT TEMP BELOW 0 DEG C FOR ABOUT 9 HRS BEFORE TEMP WENT ABOVE 0 DEG C. ENGINE SYS DIAGNOSTIC CODES AFTER LANDING WERE AS FOLLOWS: LANE A AND LANE B FOR BOTH THE LT AND RT ENGINES - GB, 0 GB, 1 GB, 2 THROUGH 6 BLANK. ACFT WAS DE-ICED WITH TYPE 1 AND TYPE 4 FLUID PRIOR TO DEPARTURE. INSPECTED BOTH LH & RH ENGINE P3 AIR TUBES FOR TRAPPED MOISTURE. REMOVED AND REPLACED BOTH LT AND RT ENGINE AIR PRESSURE TRANSDUCERS, PERFORMED OPS CHECK WITH NO DEFECTS NOTED. ALL MX PERFORMED IAW MM 75-30-03 & 71-00-00.