As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: WHEN AIRCRAFT WENT TO IDLE ON DESCENT, FO AND MYSELF NOTICED HEAVY "DIRTY SOCK" SMELL. IT WAS ONLY IN COCKPIT. MAINTENENCE DEONTAMINATED APU AND ACCOMPLISHED J/C 26L00021002 AND 26L00021014, NO LEAKS NOTED FROM APU OR COMPONENTS. OK FOR CONTINUED SVC.