I was reading this thread going thought the same process and thought I would close the question of which port where the Pipe plug (part number 15H275) should be installed. The pipe plug is to be installed behind the fitting for "hose 4" marked with a blue star in the above photo/graphic, posted by flyweight. Attached is the instructions from the owner's manual which also verifies this location as B in the bottom photo on the attachment.
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