You've lost the Shuttle and the crew; neither can survive reentry from that altitude. Well, maybe not so, since the Shuttle is supposedly capable of doing a skip reentry, but it has never actually been done in reality. I have no idea if SSM2007 could simulate a skip reentry, though.
You'll have to try to get a lower orbit and hope that NASA can get Challenger into service a couple years ahead of schedule. Even if they can't, still get to a lower orbit, so Challenger can bring the bodies of your crew home and attach a deorbit module onto Columbia, so she doesn't pose an orbital hazard in the future.
You did manage to break the apogee record set by Pete Conrad and Robert Gordon Jr. during Gemini XI by 200 nautical miles.