On 1995-08-18 at 1155 CDT, at Lubbock, Tx there was an accident that caused mnor damage:
http://www.fss.aero/accident-reports/look.php?report_key=1207
rzjets states the aircraft is still current:
http://rzjets.net/aircraft/?page=24&typeid=47
Every thing seems to indicate Southwest is still the owner and that the ship maybe stored for now:
http://www.planespotters.net/Production_List/Boeing/737/22948,N309SW-Southwest-Airlines.php
Walt