One quick tip. To "Force Range" change the zip code to something different, it has to be away from the location you are in. Wait a few minutes then change it back. The transmit unit should readjust for timing.
How would i for example check the modem status on a 4000? (I know on a dw6000 or dw/hn7000 i would type in 192.168.0.1) I have pretty good experience troubleshooting the newer systems but not the older ones.