What was found
RT AFTER LANDING AND DURING TAXI IN BOTH F/A AND SOME PAX NOTICED A JET EXHAUST TYPE SMELL IN THE CABIN. NO VISIBLE SMOKE OBSERVED. THE SMELL WAS NOT NOTICED IN FLIGHT BUT ON LANDING AND DURING STARTUP. THE F/O WENT TO THE BACK OF ACFT AND STATED HE SMELLED THE SAME THING. C/W BOROSCOPE COMPRESSOR WASH AND FIM TASK 79-00-00-810-807 INTERNAL OIL LEAKAGE, DH8-400-SL-21-012A ECS CONTAMINATION, FOR BOTH ENGINES, FOUND NR 1 ENGINE, 4 INTO 1 COMBUSTER / EXHAUST DRAIN LINE RUPTURED PN 3048015-02 LEAKING INTO NACELLE, REPLACED LINE. ALL CHECK GOOD. RETURNED TO SERVICE.