Buzzy: If you are trying to hear the StarCom21 system you can not with the PRO164. StarCom21 is entirely digital and can not be heard on analog only scanners like the PRO164. Also, in your area some of the sites use 700 MHz., also impossible to hear on the 164.
You need one of the newer Uniden or GRE scanners, such as the PSR500, PSR600, BCD996T or BCD396T. These do digital and 700 MHz.
As for TG 13089, we have had reports of it's use but we have not been able to pin down for what yet. It is likely an ISP talkgroup being in the 13,000 series.