As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ENG OIL SMELL IN MAIN CABIN THRU NR 2 PACK, COCKPIT OK & NO SMELL. SUSPECT NR 2 ENG. DETERMINED PROBABLE CAUSE OF SMELL TO BE FROM NEW NR 2 HEAT EXCHANGER CHANGED ON 7/22. PERFORMED MULTIPLE ENG RUNS & NO OIL SMELL NOTED. COMPLIED WITH ETN-EM-72-034.