What was found
FLT# 1411, FLL-AUA. STRONG ODOR ON DESCENT FROM FL 140 TO GROUND -NOT IN CLOUDS -STRONG DIRT SOCK SMELL -COCKPIT STRONGEST ODOR LOCATION - CLEARED AT GATE WITH APU ON & BOTH PACKS ON - MX 270 CABIN ODOR REPORT COMPLETED ( PACKS ); UNLOCKED FLOW CONTROL VALVE ON #1 PACK. ACCOMPLISHED INSPECTION OF PACK W/ NO FAULTS NOTED. ACCOMPLISHED INSPECTIION OF APU FOR OIL RESIDUE/LEAKS WITH NO LEAKS OR RESIDUE NOTED. ACCOMPLISHED GROUND RUN OF BOTH PACKS WITHG APU BLEEDWITH NO ODOR NOTED. THIS CLEARS MDDR # 440660. MX-4 UPDATED, PLACARD REMOVED. NO ODOR EVENT WRITE-UPS IN LAST 30 DAYS.