What was found
AIRCRAFT WAS GROUNDED: DURING DESCENT LEVELING AT FL290 WITH THROTTLE ADVANCED ON THE FLIGHT DECK THERE WAS A CABIN FUME SMELL NOTICED BY ALL CREW MEMBERS. SEEMED MORE PREDOMINATE ON FLIGHT DECK. IT SMELLED LIKE OIL. FLIGHT CREW HAD TO PUT ON OXYGEN MASKS. PERFORMED T/S PER J/C 09L00021001, FOUND ODOR COMING FROM ENGINE2. CONTINUED J/C TO COMPLETION AND VERIFIED ODOR IS NO LONGER PRESENT AT THIS TIME, NO FAULT FOUND.