As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: SOF EVENT. VERY STRONG SMELL OF SWEATY MUSTY SOCKS DURING GROUND OPERATIONS AND THE DESCENT PHASE. SMELL WAS PRESENT THROUGHOUT THE CABIN AND FLIGHT DECK. SMELL DISSIPATED WITH PACKS OFF. MAINTENANCE TROUBLESHOT PER TSM 30-21-00-810-859-A, FOUND ENG NR 2 NAI MUSCLE TUBE LEAKING AND REPLACED NAI MUSCLE TUBE IAW AMM 30-21-11.