As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT TOOK OFF FROM MKE AND SENT AN ACARS SAYING THEY HAVE A POSSIBLE PANEL OPEN AND THAT THEY ARE RETURNING TO MKE. THEY PROCEEDED TO GO BACK TO MKE AND BUILT UP AN AIR RETURN. ON THE WAY BACK THEY ALSO RECEIVED A STALL FAIL. AIRCRAFT REMOVED FROM SERVICE. SECURED CREW O2 PANEL. NO DISCREPANCIES NOTED AT THIS TIME REF AWAC SUPP 09-053F. NOTED BY MAINTENANCE.