As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- THE CREW NOTED THAT A BURNING ODOR IN CABIN AND COCKPIT AFTER NR 2 ENGINE START UP AND AFTER NR 1 ENGINE SHUT DOWN. MAINTENANCE COULD NOT DUPLICATE ODOR ON GROUND, NO DEFECTS NOTED AT THIS TIME. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.