As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED STAB TRIM AND MACH TRIM CAUTION MESSAGES AT CRUISE. QRH DIRECTED FLAPS 20 LANDING, WHICH WAS SUCCESSFUL WITH NO ISSUES. ATTEMPTED TO REENGAGE MULTIPLE TIMES WITHOUT SUCCESS. AIRCRAFT REMOVED FROM SERVICE. ACARS EMAILS REPORT FO STAB TRIM DISCONNECT SWITCH STUCK. R&R FO STAB TRIM DISCONNECT SWITCH IAW AWA SUP 10-048D. OPS CHECK GOOD