Since the debt is six years old, it's probably not having that great an impact on your FICO.
If you are in a financial position to do so, offer a PFD. $2,505 is not chump change and if you're actually willing to offer a PFD, they should accept it.
OTOH, unless you are making at least $80K or so a year, you've probably got better uses for your money than paying a six year-old CO. It will fall off your report in the summer or early fall of 2009 anyway due to old age.