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The thing I’d try first would be `pulumi refresh`, probably with `us-east-1` first, and assuming that worked, then destroying and repeating with `us-west-2` . Have you tried that?

Sorry for the late reply! I tried pulumi refresh individually for both regions and neither worked. I think the mix of resources recorded in each region causes the “invalid ARN” error and it blocks the refresh. 

Perhaps this wouldn't fix it but, is there any way to ignore errors with refresh and just refresh the resources that didn't error?

I’m starting to delete the resources manually. I’ll try refreshing later and see if it works after I’ve deleted some of them.