So Hi first time poster! I bought a PL 400 Series II off CL and will be performing a WOPL Control Board, DC Caps, and Transistors upgrade. This Series II came missing all 3 fuse caps. Also all three fuse holders are different. I am planning to change out the AGX holders and replace the cap on the ACG. The input RCA jacks are wasted and someone did a grounding hack to probably clean up some hum. It has an insulated copper strip (horribly done) where the RCA jacks mount and 3 additional grounds from the control board were soldered on there (along with speaker grounds and sensitivity pots. I will attach a pic. I read through the forums found the Switchcraft RCAs to replace these. My question will be where was the original location for these 3 grounds from the control board? Two black and one white wire. I am guessing adding the newer Control Board and putting these back where they belong will take care of the grounding issue they were trying to resolve by this bad revision. I could even make another Copper buss bar there and reattach everything but I would prefer to see how it was originally done. Thanks so much!