As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ODOR WITH SMOKY HAZE IN COCKPIT AND CABIN AFTER TAKEOFF. FLT RETURNED TO SFO. CHECKED ALL ACFT COMPARTMENTS, CHECKED APU CHECK VALVE, AND ACM OUTLETS FOR OIL. NO SIGN OF OIL. CHANGED BOTH WATER SEPARATORS. ALSO ACCOMP ENG RUN AND PACK BURN OUT PROCEDURE. CHECK-C 8-7-98 MCI.