Xerox WC 7775 machine problems

Hello all,

I've just bought an WC 7775 as new with just 135 impressions.
We installed the printer yesterday but already deal with a couple of issues:

1. We keep getting these errors (attachment) with Extensible Service, Network Controller, Postscript, etc.
I have searched the web and the only thing i found was on xerox forum:
http://forum.support.xerox.com/t5/Printing/7775-Network-controller/m-p/8332/highlight/true#M1867

It sais one should update to new firmware (but that version is not to be found on xerox site). Also about a driver patch that nobody knows about.

2. I have a problem with color rendering, the same print we did on a WC 7132 looks so much better than on the 7775. I don't know why, but it does grays from CMYK, instead of black.

3. Altough the specs are for 2400 x 2400 dpi the driver allows maximum resolution of 600 dpi.

Any help would is greatly apreciated.