What was found
BWI - FLT 2704 - ON DESCENT INTO BWI, FROM TPA, FUMES OF SULFUR/RUBBER SMELL WAS NOTICED THROUGH OUT THE CABIN. ODOR WAS STRONGEST IN SEAT ROWS 13 TO 17 AND WAS MOST NOTICEABLE WHEN ENGINE ANTI-ICE WAS SELECTED. SMELL DISSIPATED WHEN ENGINE ANTI-ICE WAS TURNED OFF. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE ACCOMPLISHED ENGINE RUN WITH ANTI-ICE SELECTED AND PACKS ON. FOUND LEFT ACM LEAKING OIL THROUGH WEEP HOLE INTO PACK BAY. REMOVED AND REPLACED THE LEFT ACM. OPERATIONAL CHECK AND LEAK CHECK GOOD. (M)