Does anybody know what is different about the
Duke University (Durham, NC) trunking radio system?

For several years I've kept a scanner on my desk,
set to pick up 123.050, the standard helipad frequency,
and talkgroup "496" on Duke's trunked system, which is
... or WAS .. the air helicopter channel. No big deal,
but I can see all but the last 100 yards of their
approaches from my window, and having the scanner on
lets me know when to look up and see an approach or
departure.

Until today, that is--this Monday morning, 8/21, the
Duke trunked traffic is still coming in--but the IDs
have changed. Instead of "496" and "1360" as talkgroup
IDs, I'm seeing 0001-7 and 0000-10 and numbers like
that. And I can no longer hear just the helicopter
group--I'm getting EVERYTHING, requests for clean
linen in this room, shuttle vans, etc. I have been
too busy to do much research but it seems like more
than one service/area/whatever may be using the same
(strange new) numbers. I can program the Pro-94A to
hear just "496" in the old system--but this new system,
whatever it is, is still a mystery to me.

Is this connected with the "rebanding" I keep hearing
about? Does anyone have an explanation of what has
changed that is simple enough for even me to understand?

TIA!
--ken