camera shoots but most buttons not working, Rear LCD screen no longer

I got this 5D from the E-Recycling bin in a camera shop, it had a corroded Date/Time battery so i thought maybe cleaning it out and replacing the battery might fix it. initially the camera seemed to work. The camera would turn on but whenever I did any one thing it would freeze up. For example, I could turn it on and take a picture then it would freeze, or I could turn it on and navigate the menu to change a setting, then it would freeze. I left the camera alone for about a year and then charged the battery just to see if I could do more troubleshooting. Now the camera will power on and shoot as much as I want as far as I can tell, but only a few functions actually work. Currently the shutter button works, the rear control wheel and front control wheel work and the top LCD backlight button works, nothing else seems to respond. I suspect something near the date/time battery is also corroded but was wondering if anyone has seen this before and has any tips before I go digging around with my limited electronics repair experience.

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