Ltas Ctis 5 Lights

All,

I have a few LTAS 5T trucks of differing configs, that keep send an "All 5" lights flashing, similar if it was a major air leak. We done the T-shooting and it points to a elect harness. Now I could believe if it was one truck but 3 consecutive trucks NO, Any thoughts on a quick fix?

Thanks,

SFC KJ