Easy Marc. All the category E and above cabins that end in the number 3 on the starboard side and 2 on the port side have had the tubs taken out and the showers put in. There is ONE F cabin that has a shower 821. This was put in several years ago for some really good passengers who almost lived on board.
Just remember E and above and 2 and 3 and you dont need a list. ie. 953 and 952 would be shower cabins.
