As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FD MAP FLAGS PLUS SINGLE CHANNEL FAILURES OF MACH TRIM & SPEED TRIM DUE TO MULTIPLE ELECTRICAL INTERRUPTIONS FROM GROUND POWER WITH APU GENERATOR INOPERATIVE. COULD NOT REGAIN WHEN BOTH ENGINE GENERATORS BROUGHT ON LINE. ACFT GROUNDED. CYCLED POWER TO ACFT, ALL SYSTEMS RETURN TO NORMAL, NO DISCREPANCY NOTED.