As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT STAB TRIM CAUTION MSG AND STAB TRIM STATUS MSG CAME ON. AIRCRAFT BACK TO BLOCK AND MESSAGES DISAPPEARED AFTER LEFT ENGINE WAS SHUTDOWN. AIRCRAFT GROUNDED BY MAINTENANCE. MAINTENANCE PERF MCDP TEST 65 TEST PASSED. PERF MCDP 30/40 FAULT RETURNED, FAULT ON SAM FOR R FSPM . REMOVED AND REPLACED R FSPM OPS CK GOOD TRANSFERRED TO MEL 27-41-2A, MBCB 11/05/22 MX PROCEDURES 27-41-2 C/W PLACARDS INSTALLED ALL PER AMM 27-58-01/ AMM 22-00-02. AIRCRAFT RETURNED TO SERVICE.