As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4311 - CREW REPORTED STRANGE SMELL, AND SMELL OF SMOKE IN COCKPIT/CABIN. ALSO, GROUND PERSONNEL REPORTED SEEING WHITE SMOKE OUT OF RIGHT WHEELWELL. REPLACED P2.5/P3 SWITCHING VALVE. OPS CHECK GOOD WITH NO SMELL OF SMOKE OR STRANGE SMELL IN COCKPIT OR CABIN. AIRCRAFT WAS RETURNED TO SERVICE. (X)