As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START ON RECALL, MACH TRIM FAIL LIGHT ILLUMINATED, RESETS WITH MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED MACH TRIM DFCS BITE TESTS 20.33 LRU TESTS, EXT MAINT MACH TRIM BITE 60.33, CURRENT STATUS BITE 10.00 AND MACH TRIM BITE 13.00 NUMEROUS TIMES. ALL GOOD.