What's causing this Amiga's WEIRD GRAPHICAL gLiTcH?

This Amiga 600 came in with a very subtle but obvious fault. In workbench you get odd corruption at the sides of the screen and in games you occasionally see corruption around sprites but WHY? CRG Links CRG Patreon - https://www.patreon.com/user?u=13919007 CRG Discord -   / discord   CRG X (Twitter) -   / yt_crg   Chapters 00:00 Intro 00:20 The fault 04:22 Previous recap 11:38 Did that do anything? 15:58 Trying the CF card in another system 17:31 Diagrom 1.3 20:06 Diagrom 2.0 23:55 Replacing Denise 31:14 After a reflow 32:31 Replacing Agnus 40:24 Conclusion