As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DIRTY SOCK SMELL IN FLIGHT DECK WITH PACKS RUNNING SEEM TO BE SLIGHTLY BETTER WITH PACK WAS SELECTED OFF BUT STILL PRESENT. SMELLED AT GATE WITH APU AND PACKS. RETURNED AGAIN ON DESCENT AT IDLE.**SUPPLEMENTAL REPORT WILL BE SUBMITTED**(OPEN)