As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C WAS DESCENDING AT 12,000 FEET WHEN A STRONG SMELL OF ENGINE OIL FROM PACKS APPEARED FROM ENGINE NR 1 SMELL CAME FROM NR 1 ENGINE BLEED ONLY. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE CARBON SEAL IAW RRMM 72-25-25. OPS CHECK WAS GOOD AND VIBE CHECKS ALSO WERE GOOD AND WAS RELEASED BACK TO SERVICE.