Thanks for the help guys! I haven't had a good one like that in a long time. I ended up replacing the CLC board and the PS1. I found a pinched/shorted wire coming from my 5v supply in the CT box, which contributed to losing my CLC. I replaced the pinched wire, but still couldn't get original CLC to come back online. It was even more frustrating when I plugged in the new CLC and it would communicate with my tool, but refused to perform a hstwy scan. Rgggghhh... My selector would stop communicating about 3' above bottom floor during hstwy scan. I found 56 millivolts on my 5v supply, replaced the PS1 and finally got the unit running. I'm still scratching my head in disbelief. My old man went round for round with this unit a few years back right when we took it on contract and I knew it would give me a run for my money someday. It's a DMC controller on an Esco pump unit with Otis buttons and a GAL MOD operator or as my old man would say Botched! Again, thanks for the tip on the AC ripple.