There wasn't a second soundtrack released for the anime, sometimes animes just don't have all of the BGM released for them. Though the Jetters anime did have extra songs made available online for it at one point many years back, but the link is no longer active. However I had made a backup of all of the files, so here's the OST and all of the extra songs that were made public that we know it.

http://www.mediafire.com/?kmb0mx97mo1prb0