What was found
ON DESCENT PASSING THROUGH 11000 UNTIL 9000, CREW REPORTED A HARSH RUBBER SMELL IN THE FLIGHT STATION. LANDING WAS WITHOUT INCIDENT AND NO PRECAUTIONARY ACTIONS. ON ARRIVAL, ODOR DISSIPATED. AIRCRAFT WAS GROUNDED FOR UNSCHEDULED MAINTENANCE. COMPLIED WITH A DETAILED VISUAL INSPECTION OF LEFT AND RIGHT ENGINES FOR FLUID LEAKS AND INSPECTED PNEUMATIC DUCTING IAW B767 AMM 75-00-00. NO DEFECTS NOTED. ADDITIONALLY, COMPLIED WITH CONDITIONAL INSPECTION SMOKE/FUMES IN THE CABIN IAW B767 AMM 05-51-56 AND REMOVAL OF OIL CONTAMINATION FROM AIR CONDITIONING AND PNEUMATIC SYSTEMS IAW B767 AMM 21-00-21. NO FAULTS FOUND.