As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SINGLE CHANNEL MACH SPEED TRIM FAIL. GROUNDED - YES. NO FAULTS LOGGED IN FCC-A . ONLY FAULTS LOGGED IN FCC-B ARE THREE LEGS OF MACH TRIM INPUT POWER INVALID THAT WERE INDUCED BY CONFIGURATION CHANGE. NO PRIOR FAULTS WERE LOGGED. CONFIGURATION CHANGE REVERSED. COULD NOT DUPLICATE MALFUNCTION. ALL MACH TRIM AUTO, INTERACTIVE & SURFACE TESTS PASS.