Don't throw them out yet. I was working on a NBFM mod, but just moved and things are all shook up.
http://groups.yahoo.com/group/Repeater-Builder/files/FluX%20Research/SEA%20ESP1000%28M%29%2C%20ESP1100%28M%29%2C%20ESP-504/ http://pages.cs.wisc.edu/~timc/e/esp504222.html