How are the 737-900's with the "reduced" E+ section referenced in the google docs? United has an updated seat map here:
http://www.united.com/web/en-US/content/travel/inflight/aircraft/737/900/v5.aspx
But when you book that flight and use the seat-chooser, it removes the non E+ seats forward of the exit row ? (maybe they do that on purpose to avoid problems in case of a swap?)
[I think this is the same issue mentioned in post #343....didn't see anyone respond, though]