I think you have to order this through an authorised repair shop.
AVID do not sell directly to the consumer.
I'm having problems with my C|24.(not the same you got)
Living in Norway, I have to deal with a repair-shop in Stockholm, Sweden.
And they have to get parts from Irland !
I started the process in October, and it is still not solved.
AVID managed to send me wrong parts the first time,
and I'm now waiting for the second shipment.
Then, if and when i finally get the right parts, I will have to use a local repair-shop to put them in ...
If you got an AVID repair guy in in your town, you're actually lucky ...
(You could just put the board in your car and visit his shop)