As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CRRW REPORTED THAT FROM 6000 FEET TO LANDING DIRTY SOCK SMELL PREVALENT IN FLIGHT DECK, NOT NOTED IN CABIN. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU. **A SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)