As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FUME EVENT WET SOCK SMELL IN FLIGHT DECK DESCENDING THRU FL190 AT IDLE POWER WITH APU OFF. SMELL DISSIPATED AFTER PACK 1 WAS SHUT DOWN AND OTHER QRH PROCEDURES APPLIED. MAINTENANCE FOUND SOURCE WAS HYDRAULIC LEAK FROM LH WHEEL WELL MANIFOLD 2146GM INGESTED INTO APU. REPLACED LH WHEEL WELL MANIFOLD 2146GM IAW AMM 29-19-41.