Red noise or flicker on bottom half a plasma... I have a Phillips 42PF320A/37 Plasma TV (Chassis

Question

I have a Phillips 42PF320A/37 Plasma TV (Chassis # BP2.3U) that has a full screen picture and good sound but it has a red noise or flicker that is superimposed on the bottom half of the screen. (See Photo) I have replaced Plasma TV circuit boards before but am not sure which to replace this time. I suspect the Main Logic board (LJ41-03387A) but I also am not sure about the Signal Processing board because it contains the VIPER circuitry. Thanks in advance.