As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PTRIM MAIN INOPERATIVE, WARNING MESSAGE APPEARED ON EICAS IN FLIGHT WITH AUTOPILOT ON. QRH PROCEDURE WAS FOLLOWED AND BACKUP SYS OPERATED NORMALLY. T/S PTRIM MAIN INOPERATIVE IAW 24-43-00-810-801-A AND FOUND MAIN SYS CUTOUT SWITCH FAILED STEP 8 SUBTASK 817-003-A, HAD CONTINUITY. R&R MAIN SYS CUTOUT SWITCH OPS CHECK GOOD.