As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE HAD FAIRLY STRONG DIRTY SOCK SMELL. DISSIPATED AT CRUISE AND THEN RETURNED ON DESCENT PASSING APPROXIMATELY FL240. REMAINED THROUGHOUT LANDING. FUME EVENT. DURING R/H ENGINE BOROSCOPE FOUND INTERNAL OIL LEAK. THE ENGINE R & R. POST ENGINE CHANGE RUNS COMPLETED WITH NO FUMES NOTED.