Harmy said:

@canofhumdingers: I don't know, wouldn't red make it even more brown? If anything, I'd say it would need more blue and then the walls get too blue. And if you boost reds, the walls become purple.

Yes exactly, in order to remove the orange tint and get those walls closer to white, I believe you would have to actually reduce the reds a bit rather than increase them, then boost the blues by at least double the amount you've reduced the reds, in some cases a little more, in some cases a little less. That's what I've found from messing about regrading some of the scenes from your workprint anyway.