We have a MIcs that we took over- seems we needed at one point to replace the line card running lines 1-4 they went dead and the card was bad. We went in again about 1 month later and line 2-4 were dead we rebooted system and they came back. Because they were getting some type of surge on the lines we put in line protectors also. Now every 2 months or so they loose lines 1-4 and we have to power up and down and they come back. I have recommended the client replaces the KSU because I feel it has some type of issue from the surges or something ??? Any ideas ???