Dreaded "checky hybrid system" issues, need advice

So I've had issues for a while now with my 2010 Prius trim 5.

It popped a "check hybrid system" code last year.

I have a guy who rebuilds batteries and they seem to do very well He put one in my 2nd gen and it made it over 50k miles zero issues... till someone hit me and totaled car.

I called my battery guy first. He came out, brought his techstream laptop.. poked at it for about 30 minutes Iran voltage graphs, floored it and let it idle etc... to put stress on battery.

He said "it's not your battery, I could charge you, put one in and you'd be no better off... it is NOT your battery" He suggested it might be the EGR valve.

So I take it to Toyota... the first thing they say is it's the battery, quote me 3000 something bucks and say that it when your ready we will book a service date.

So now I go down a lonely road where I'm not sure what to do next... spending 3k at Toyota not an option.

I ordered a brand EGR valve off eBay from a Toyota dealer in CA and replaced it. It looked a bit funky but that didn't fix it.

I also bought an "exhaust leak detector" and checked the head gasket... as I've read they are very prone to failing on 2010's. Luckily my results were no head gasket issues.

I've also read that carbon deposits in intake can cause the "check hybrid system" warning.

Prior to all of this I had a coil going bad and was having a misfire on cylinder #2. I tore down everything and replaced all plugs and coil packs.

I feel like I'm just throwing darts with a blindfold on.

I put together my own laptop with Techstream on it and I have yet to be able to get the lights to pop while I am connected and recording the graph of all battery cells. It'll run for an hour or more (more than max recording time of Techstream data recording) and then pop. Just my luck I'll be busy driving and not get another graph recording when it finally does throw "check hybrid system" light.

I hooked up my laptop before resetting it from the last time the lights came on after resetting everything and these are the stored codes in system.

Can anyone please suggest my next course of action? I've thought about driving it to Atlanta to the 3rd party hybrid repair shop there. I've heard good reviews of them.

I'd rather take it to St Louis as it's closer to where I live but haven't been able to find a shop that specializes in hybrids there.

sorry for the long post... I'm just at a loss and could use advice.