What is the modification, I have not looked inside that amplifier
I've bypassed it, yes. I gutted it, and replaced it with a MiniDSP signal processor. This gives me the ability to control crossovers on all speakers and it also has a 31 band EQ per channel.
I have a temporary external amp hooked up, and it's already leagues better than the original.
Today, following the write up posted here, I hooked the camera up to my new head unit.
Then cleaned it. While I was working on it, I resoldered the tabs on the rear defroster, and hooked the wire back up. Also replaced the broken clip that holds the wind deflector in. Still have a bunch of little projects to do to it. Most notably, fix the paint runs on the dash were I installed the new head unit.