I am working on an ACS R5 where the lights light up on lines one and two (they only have two lines) and there is nothing there, when you pick it up it's just re-order tone. The LEC has checked the lines and says they are good at the 66 block. I have grounded the system, put a UPS on it, re-set the system, and checked the wiring. Yet problem still occurs. It is in a 2-slot carrier. Any suggestions??