What do the leds indicate on the Crius AOIP V1 board?

[N7KI]

There are 7 leds on the board, 2 red ones, one rx, one tx, and 3 others labeled a, b, and c.  I haven';t found any information on what they mean.  Probably the tx and rx are intuitive but what are they tied to?  Are they usb, serial or what? 
Thanks for any help.

[Jumpy07]

A, B and C are in the manual.. the rest are either power or serial port activity

http://www.multi-rotor.co.uk/index.php?action=dlattach;topic=595.0;attach=1440

[geeriff]

reference your question about the crius leds, I found this link which explains all : http://www.unmannedtech.co.uk/3/post/2013/02/all-in-one-pro-board-setup-with-megapirates-code.html

cheers

[Gaza07]

Nice pictures on the link you gave although they would be seeing as they have been taken from this site