As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE PIT-IAH. DURING FLIGHT, NOTICED OILY ODOR AT MID-CABIN. FLIGHT CONTINUED AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE OPERATED THE AIR CONDITIONING PACKS WITH THE APU. NO ODOR DETECTED. CHECKED APU AREA. NO OIL DRAINAGE NOTED. FOUND AIRCRAFT OK FOR SERVICE.