As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDIS 602 21-01 2179641 13MAR21 ORD CLOSE FUMES SMELLED IN FLIGHT DECK DURING TAXI TO GATE FACT 13MAR21 20:49 ORD INSPECTED BOTH PACK SYSTEMS FOR ANY OBVIOUS DEFECTS. NO DEFECTS FOUND. PERFORMED OPS CHECK OF BOTH SYSTEMS WITH CREW FOR 20+ MINS. NO SMELLS NOTED. OK FOR SERVICE