As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK DUE TO PTRIM NML FAIL CAS MESSAGE AFTER MANUAL PITCH TRIM ACTIVATION RESULTED IN NO TRIM INPUT NEAR THE INITIAL LEVEL-OFF ALTITUDE. BACKUP MODE PITCH TRIM WAS USED FOR THE REMAINDER OF THE FLIGHT. AIRCRAFT LANDED WITHOUT INCIDENT AT KMDW. REPLACED #1 FCE IAW EMB 505 AMM 27-03-01. OPS CHECKS GOOD.