which group for google + business issues?

I've been searching for a group to discuss Google + Places/Business issues, but can't find one. Sorry to post here, but could someone point me to the relevant group? My specific issue: I can't find where to upload banner for my business places listing. I easily found it for my personal G+ page, and although I can upload photos to my G+ business page, I don't see where I can upload the banner (currently it shows the Google map). My page: https://plus.google.com/117686035908508222805

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