What was found
FLT 1095, BOS-PUJ. RETURNED TO FIELD (BOS). AFTER TAKEOFF CLIMBING THROUGH 10,000, FUMES SMELT IN COCKPIT & CABIN. DESCRIBE SMELL AS BURNING PLASTIC. CABIN CREW DESCRIBED SMELL AS ACRID SMELL DISSIPATED IN COCKPIT & FRONT HALF OF CABIN. SMELL REMAINED IN MIDDLE & BACK OF CABIN; INSPECTED BLEED SYSTEM FOR CONTAMINATION AND FOUND CONTAMINATION DOWNSTREAM OF NR 2 ENG HP VALVE. CLEANED DUCT AND HP VALVE AND RAN ENG'S IN ALL CONFIGURATIONS TO CHECK FOR ODORS. NO ODORS NOTED.