(the system is listed as rebanded and that could cause you issues depending upon which radio you have and what method you used to do your programming).
Guilford County's P25 system appears to have a tower in Thomasville...
I added it straight from here I added another an it work fine the Thomasville one won’t work I can get the signal off an on but will not hear or stop on anything like it does the other trunk system I have
So this is interesting.... they have probably switched over to the Greensboro/Guilford County system (makes sense based on what you were hearing and the fact that Guilford County has an ASR in Thomasville....)
ok thanks that explains it just confused me when I seen it said it was moto an it would never work. Never seen the one from the Greensboro system till now
Can't really say much about the old Motorola system but if they've switched over, perhaps the old system is dead and gone... perhaps someone close can chime in.
This thread seems to chronicle the switch-over - which seems to have started almost a year ago.
Is the old system still powered up (control channel active) and just not being used or turned off? I know some places keep their old systems in place for lower priority users (at least for a while) while other places keep it running for a time to "fall back" to if needed - but eventually they go away.