As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX NOTICED WHITE SMOKE COMING OUT OF INLET AND OUTLET PRECOOLER. FOUND OIL FROM DC GENERATOR EXHAUST WAS COLLECTING IN PRECOOLER AIRSCOOP. CLEANED COWLING DC GENERATORS AND PRECOOLER, AS NEEDED OPS CHECK ENGINE IAW AMM 71-00-00. OPS CHECK GOOD IAH 12-17-2006.