Rear Deck? As in floor of the rear cockpit? I flew T-28B/C at NAS Pensacola in 1974 and I seem to remember the cockpits being good old "battleship gray". 45 years ago and the mind is fading...
Fun bird to fly, though. I really liked formation and Running Rendezvous. Acro was great, too.
The area I was trying to find information about was the area behind the back seater and under that massive canopy. Looks like it included a strobe light or position light dome but that would be strange.