As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM / MACH TRIM MESSAGE APPROX 7000 - 8000 FEET. APPROX 200 KNOTS. THEY WOULD NOT RE-ENGAGE. MULTIPLE ATTEMPTS. AUTO-PILOT NOT ENGAGED. ******AIRCRAFT REMOVED FROM SERVICE********* R/R FO PITCH TRIM DISCONNECT SWITCH IAW AMM SUP 10-048D. OPS CHECK GOOD