As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING DECENT BELOW 10,000' FUME ODOR DIRTY SOCKS STRONG IN AFT CABIN SLIGHT IN FORWARD CABIN / FLIGHT DECK. AFTER LANDING TURNED #1 AND #2 PACKS ALONG WITH #1 AND #2 BLEED OFF AND SMELL DISSIPATED. MAINTENANCE ISOLATED SOURCE OF ODOR TO THE APU. REPLACED APU AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER TASK CARD 26L31049003.