want device file for HP designjet 2500cp

[Blaise Canzian]

Does a ghostscript device file for the HP DesignJet 2500CP exist?  RIght 
now, using the output device "dnj650c" creates binary output that prints 
on our HP 2500CP but the transfer function (color tables) are not quite 
right, producing output that is too dark.  Looking at the dnj750c file 
that is on disk, I can see where the transfer function for each color is 
called out.  So I am looking for a device file specifically for the 
HP2500CP, or some hints about how to modify such a file to make my own 
custom file that works better.  Thanks.