As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2426, THE CREW REPORTED A STRONG ELECTRICAL BURNING ODOR IN THE COCKPIT AND CABIN AFTER TAKEOFF. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT ELECTRICAL COMPONENTS, RAN THE PACKS FOR EXTENDED PERIOD WITH NO ODOR NOTED. THE AIRCRAFT WAS SUBSEQUENTLY APPROVED FOR RETURN TO SERVICE.