As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3630, CREW REPORTED THAT ON PUSHBACK, FLIGHT ATTENDANT ADVISED PASSENGER "SMELLED SMOKE". AIRCRAFT REMOVED FROM SERVICE. RAN APU AND TURNED ON PACKS. OPENED GASPERS AND TURNED ON ALL LIGHTING. WALKED THROUGHOUT CABIN . NO ODOR OR SIGHT OF ANY SMOKE. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.