As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4227 - DURING CRUISE, CREW REPORTED A STRONG ELECTRICAL ODOR AT FL280. THE F/A NOTED THE ODOR AS SHE APPROACHED THE COCKPIT DOOR. ODOR DISSIPATED SHORTLY BEFORE THE APPROACH TO DSM. AIRCRAFT REMOVED FROM SERVICE. PERFORMED INSPECTION OF COCKPIT AND FORWARD AVIONICS. NO DEFECTS NOTED IAW AMM 06-41-02, 30-42-03 AND 20-17-03. AIRCRAFT RETURNED TO SERVICE.