how do I edit a map that I’ve already published?
You pretty much have to upload a new test map, set the memory allocation and resubmit the map with the same name and thumbnails etc as the original and get it approved.
I hope it is better working now because I have made a tiny edit and it’s taken multiple submissions to get it approved again 
Total do over.
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Will the island code still be the same?
Yes it gets it’s own private code, but once approved and you set it as the published island, it uses the same published island code as the previous published island for that project.