As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON MASTER CAUTION RECALL AFTER START CHECKLIST GOT A MACH TRIM FAIL LIGHT. AS PER QRH IT DID RESET ON SUBSEQUENT RECALL. GROUNDED - YES. CYCLED SHIPS POWER. ACCOMPLISHED DFCS BITE REF B737-800 FIM TASK 22-11 TASK 801. CURRENT STATUS PASSED MACH TRIM A AND B PASSED. OKAY FOR SERVICE.