As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRIC BURNING SMELL IN COCKPIT. *S/D* THE CONTROL DISPLAY UNIT (CDU) WAS REPLACED WITH NO EVIDENCE OF CONTINUED BURNING ODOR IN AFFECTED AREA. THE REMOVED CDU WAS INSPECTED AND TESTED WHICH IDENTIFIED A LOOSE LOCKING INSIDE THE CHASSIS ASSEMBLY, BUT NO EVIDENCE OF BURNT OR DISCOLORED ELECTRICAL COMPONENTS FOUND.