As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PTRIM MAIN INOPERATIVE, MESSAGE ON EICAS IN FLIGHT. ALSO, AP MISTRIM CAUTION MSG CAME ON. BUT EXTINGUISHED AUTO PILOT WAS DISCONNECTED. T/S CMC MESSAGE HORIZONTAL STABILIZER CONTROL UNIT FAILURE IAW FIM 27-43-00-810-801A. R & R THE HSCU IAW AMM 27-40-01 AND PERFORMED OP'S CHECK IAW AMM 27-40-00. OP'S CHECK IS GOOD.