Being an optimistic sort, I'd store that refer somewhere while waiting for a better solution. Some after market entrepreneur will come up with a reasonable cost replacement board, or the guts of the system will become repairable or something like that. In other words, wait it out.
Meanwhile, I'd find a lower cost home type refer to fit into that hole. Samsung makes a line of RV usable refers. In fact, a Home Depot I was in here in Tucson recently had some low cost mini models that might work.
This would be akin to buying a clunker while waiting for the cost of a new engine for your car to come down because a neighbor kid poured sugar in your fuel tank.