As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRICAL SMOKE AND FUMES WERE OBSERVED IN THE COCKPIT WHILE EN ROUTE. ALSO, THE MASTER CAUTION FUEL LIGHT ILLUMINATED. THE AIRCRAFT WAS DIVERTED TO DCA WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE FUEL SYSTEM MODULE AT FAULT. THE FUEL SYSTEM MODULE WAS REMOVED AND REPLACED, OPERATIONAL CHECKS WERE GOOD.