What was found
FOUL ODOR WHEN NR 1 PACK WAS SELECTED AND ON ENGINE BLEED SOURCE ODOR IS LESS WITH APU BLEED SOURCE, AND GONE WITH THE PACK OFF. THE ACFT WAS REMOVED FROM SERVICE. PERFORMED ETN-EM-72-034 AND DETERMINED ENGINE NR 1 BLEED TO BE THE SOURCE OF ODOR. FOLLOWING THE FIM 72-00-00-810-814 UP THROUGH STEP BLOCK 10, SOME EVIDENCE OF OIL STAINS WERE FOUND ON IGV BLADES. ALSO BLOCK 12 WAS CHECKED AND SPANNER LOCK-NUT PLUG DIAPHRAM FOUND IN GOOD CONDITION. R & R NR 1 ENG 0 CARBON SEAL UP TO SUB TASK 72-25-25-965-001 IAW MM 72-25-25 NO DEFECTS NOTED ON DIMENSIONAL CHECK CARBON SEAL. ACCOMPLISHED E1 ETN NO DETECTABLE SMELL IAW ETN-EM-72-034. THE ACFT WAS RETURNED TO SERVICE.