Found this link on another forum–apparently referencing some amazing color photos that were sold on eBay/Germany in 2004 of planes at the Munchen-Riem Airfield after capture, showing one of the JV44 Fw190D-9’s…settles the question of whether the undersides were black or red…obviously the photos have been altered/defaced for display online, but they show enough detail to be very enticing–would love to know the history, and how to obtain the photos, whether they are published anywhere…they are just beautiful!
http://forum.keypublishing.co.uk/showthread.php?p=621133#post621133