As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MACH TRIM FAIL ILLUMINATED ON RECALL CANCELS WITH RESET. GROUNDED - YES. PERFORMED B737-800 FIM 22-11 TASK 801 FOUND FAULT MSG 22-11334 ON LEG 2, RESET 2 EACH C/B'S. RAN MACH TRIM SYSTEM TEST MULTIPLE TIMES, ALL TEST PASSED. ALSO REF FIM 22-16 TASK 835, TEST PASSED.