As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERSION - DURING FLIGHT AIRCRAFT DEVELOPED A STRONG OILY SMELL IN THE MAIN CABIN. ALL ENGINE AND HYDRAULIC INDICATIONS NORMAL. INSPECTED AND CLEANED AIR CONDITIONER DUCTS IN THE A/C BAY PER MM. REMOVED AND REPLACED LT PRIMARY AND SECONDARY HEAT EXCHANGERS PER MM. REMOVED AND REPLACED LT ACM PER MM.