That's the same code I just dealt with. It would sometimes pop up every 4 or 5 days, and sometimes more than once in a day. Only difference is mine was C1130-66 (AF), but I've never really made sense of what the code in the parenthesis means on these.
I had already replaced my front struts about 20k miles ago, and my front valve block a month ago or so, and the code was still popping up.
Code seems to finally have gone away when I replaced my rear air struts, and then the rear valve block the next day. Not really sure which one of those did it, but based on a lot of searches it could have been either of those. If I had to guess, I'd say it was the struts. Almost 130k miles on them, so they were probably due.
A good place to get OE Land Rover parts for these at a lower cost is from the UK. LRParts, LRCentre, etc. Shipping is reasonable and I get the stuff just as quick as if I ordered from a lot of suppliers in the U.S.