Map Layer 2 got... weird

I'm hoping someone can advise me.

I'm working on the next release of my hack. Somewhere along the way, Layer 2 of the Figaro Castle at night map got FUBAR'd. Now, during the Figaro brothers flashback, the map won't load and the game hangs.

Is there any way to pull a clean copy of either that map layer or the whole map from a vanilla rom and copy-paste over to my hack? I do this a lot when I make a boo-boo but I don't know where this particular map is stored in the data.

Any help is appreciated. I have all my changes made and was doing a final run through to test everything, and... here I am.

Thanks.