I'd tend to replace it all with new wire and maybe CAT-5 if you can.
Even if CAT-5 isn't fully or half used, the quality is there and the
number of pairs and such are. It is more expensive, but a single run
or two might be ok.

Martin
--
Martin Eastburn, Barbara Eastburn
@ home at Lion's Lair with our computer
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder