A gas turbine engine comprising: a duct assembly , the duct assembly comprising: a casing body that extends between a flange and a wall ; a first discrete cooling passage formed in said casing body ; a second discrete cooling passage formed in said casing body circumferentially spaced from said first discrete cooling passage , wherein at least one of said first discrete cooling passage and said second discrete cooling passage includes an axial portion and a tangential portion configured to turn a cooling fluid (F2) communicated in each of said first and second discrete cooling passages radially outward; at least one view port that extends through said wall and providing a line of sight (LOS) to said flange ; a plug removably insertable into said at least one view port ; and a case that interfaces with said flange at a joint between said case and said casing body , wherein the joint is a male/female connection with the flange defining the female portion of the connection and an end of the case defining the male connection; and a first component that is conditioned by said cooling fluid (F2), wherein the gas turbine engine further comprises a second component that is conditioned by a second cooling fluid (F) communicated along an outer surface of said casing body , said second component being different from said first component ; and the duct assembly further comprises a retainer received within a slot of said at least one view port for retaining said plug within a bore of said at least one view port . a duct assembly , the duct assembly comprising: a casing body that extends between a flange and a wall ; a first discrete cooling passage formed in said casing body ; a second discrete cooling passage formed in said casing body circumferentially spaced from said first discrete cooling passage , wherein at least one of said first discrete cooling passage and said second discrete cooling passage includes an axial portion and a tangential portion configured to turn a cooling fluid (F2) communicated in each of said first and second discrete cooling passages radially outward; at least one view port that extends through said wall and providing a line of sight (LOS) to said flange ; a plug removably insertable into said at least one view port ; and a case that interfaces with said flange at a joint between said case and said casing body , wherein the joint is a male/female connection with the flange defining the female portion of the connection and an end of the case defining the male connection; and a casing body that extends between a flange and a wall ; a first discrete cooling passage formed in said casing body ; a second discrete cooling passage formed in said casing body circumferentially spaced from said first discrete cooling passage , wherein at least one of said first discrete cooling passage and said second discrete cooling passage includes an axial portion and a tangential portion configured to turn a cooling fluid (F2) communicated in each of said first and second discrete cooling passages radially outward; at least one view port that extends through said wall and providing a line of sight (LOS) to said flange ; a plug removably insertable into said at least one view port ; and a case that interfaces with said flange at a joint between said case and said casing body , wherein the joint is a male/female connection with the flange defining the female portion of the connection and an end of the case defining the male connection; and a first component that is conditioned by said cooling fluid (F2), wherein the gas turbine engine further comprises a second component that is conditioned by a second cooling fluid (F) communicated along an outer surface of said casing body , said second component being different from said first component ; and the duct assembly further comprises a retainer received within a slot of said at least one view port for retaining said plug within a bore of said at least one view port . <EOS>