Ah yes, the PU01 Blending board. Yuck! IIRC it's buried under the lighting and requires almost complete disassembly of the face to access. I remember a few choice curse words during that work. I replaced all 8 e-caps and 6 to-92 transistors, although none of them were trouble makers so not necessary. Back then I wasn't as focused on films and didn't replace those. Probably won't go back and do any further upgrades to that unit unless I can solve the dolby issue.