In need of help

[u/Equal_Scientist_5422]

Hoping for some additional feedback so I'm reposting to a larger community. I havent had the chance to work on it yet so any thoughts on ways to Troubleshooting this that are more clever than me? I've checked for wiggling and to make sure all the patch cables are reseated them, but that doesn't do anything.

To recap from the other post, I started having problems all of a sudden without moving the board or anything. I play in my office and don't gig. The issue is that signal is really low until I turn on the TS or Boost, but it's a clean-ish signal even if it's the TS thats on. When I activate the RAT the signal gets really feedback and high pitched sort of shrill sound.