It's mentioned in Aronstein and Piccirillo's excellent AIAA publication "HAVE BLUE and the F-117A: Evolution of the Stealth Fighter". Images of most of the other modifications or test configurations (like the extended dogtooth wingtips) have been published, nearly all of which can be viewed in Mailes' and Landis' F-117A Photo Scrapbook, but this one seems relegated to a few ines of text in the AIAA work. Perhaps it remains classified due to the F-22 connection? Whatever the case, it's interesting that this seems to be a forgotten or overlooked bit of the F-117A development program, much like the AIM-9 ground firings.