As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YD FAIL UPPER B CAS MESSAGE DISPLAYED WHILE CLIMBING THROUGH APPROX FL240. COULD NOT VERIFY DISCREPANCY AT THIS TIME. DUE TO PRIOR HISTORY, REMOVED SUSPECTED FAULTY YSAC COMPUTER. PERFORMED OPS CHECKS WITH NO DISCREPANCIES NOTED AT THIS TIME. ALL WORK PERFORMED IAW (X) MM 27-24-01.