What was found
KE/SBN - FLT 1162 - THE FLIGHT CREW SMELLED AN UNUSUAL ODOR WHEN THE BLEED AIR VALVES WERE TURNED ON AFTER TAKEOFF. THE CREW PERFORMED AN AIR TURNBACK TO MKE AND LANDED WITHOUT ANY OTHER PROBLEMS. ONCE ON THE GROUND, MAINTENANCE INSPECTED THE A/C, THEY NOTED THE PREVIOUS EVENING A COMPRESSOR WASH WAS PERFORMED ON THE LT ENGINE. THE A/C WAS GROUND RUN UNTIL THERE WAS NO MORE ODOR, THEN THE A/C WAS RELEASED. (X)