As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO THE GATE WITH THE PILOTS FMS BLANK. THE PILOT NOTICED THE FMS CB POPPED AND SAW SMOKE COMING FROM THE CB. MX PLACED THE FMS ON MEL AND THE AIRCRAFT DEPARTED WITH NO FURTHER DISCREPANCIES. MX REPLACED THE DISPLAY UNIT.