In http://svn.ghostscript.com/ghostscript/tags/ghostpdl-8.71/urwfonts/ , LetterGothic-BolIta.ttf file is not included. In version 8.70 or former, LetterGothic-BolIta.ttf file exits. Please include LetterGothic Bold Italic file.
It was mistakenly included in previous releases, it is not of the PCL resident font set.