As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 375, THE CREW REPORTED A STRONG ODOR COMING FROM THE NR 1 PACK WHEN SUPPLIED BY ENGINE BLEED AIR. MAINTENANCE INSPECTED THE AIRCRAFT AND DETERMINED THAT THE ODOR WAS CAUSED BY RESIDUAL FLUID FROM THE PREVIOUS NIGHT COMPRESSOR WASH, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.