As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING TROUBLESHOOTING IT WAS DETERMINED THAT THE NUMBER TWO ENGINE WAS CAUSING SMOKE AND HAZE INTO THE AIR CONDITIONING SYSTEM. MAINTENANCE REMOVED AND REPLACED THE NUMBER TWO ENGINE, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.