As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MECHANICAL ISSUE. RTFL ON T-O ROLL AT 125 KIAS GOT RUDDER RATIO AND MACH-SPEED TRIM EICAS AND LIGHTS. REFLY. CREW REPORTED THAT RUDDER RATIO AND MACH SPEED TRIM EICAS MSG APPEARED ON TAKEOFF AT ROTATION. REPLACED RT AIR DATA COMPUTER IAW MM. AFTER TEST FLIGHT. AIR DATA COMPUTER WAS NOT AT FAULT, MACH SPEED TRIM AND RUDDER RATIO EICAS MESSAGES STILL REAPPEARED. CONTINUING TO TROUBLESHOOT. REINSTALLED ORIGINAL ADC.