Photo from another uncontained CFM56 engine on a Southwest 737 in 2007. Similar marks on fuselage to the recent flight.
"Once the aircraft was back on the ground it was discovered that there were "impact marks along the fuselage from about 10 feet aft of the right-hand forward entry door to about 6 feet forward of the right-hand aft entry door and along almost the entire length of right wing leading edge. The right horizontal stabilizer also exhibited impact marks along almost the entire leading edge." The aircraft's pressure vessel was not punctured."
http:// aircrewbuzz.blogspot.com/2009/06/final-report-2007-southwest-airlines.html