OBD2 Codes P0AFA, P3019, P3000, please help

Hello everyone, I'm having some issues with my Prius and I'd like to get some input from some experts.

To start, here is some background information. The hybrid battery was replaced I think about 30000 miles or 5-6 years ago, before we bought the car. A few years ago, I had the P0AFA code (and if I remember correctly, sometimes it wouldn't start), so I took everything apart and replaced the hybrid battery wiring harness/busbar thing and the HVECU. I believe it was caused by water entering the car and causing corrosion. There was a ton of water in the trunk spare tire well and along the rear passenger footwells I sealed up the leaking areas and continued on my way for several years with no issues. Now, fast forward a few years, I went to college so the Prius has been sitting rarely driven at my parents' house in an EXTREMELY wet area. This is what led to the current issues I think.

So now I have a P3019 code. I have P3000 as well but that seems to just be a general code. The car starts and drives, but sometimes it has almost no acceleration and I don't think the electric motor is putting down any power at all. I will post some screen shots from Dr. Prius, but it says module 9 has a higher internal resistance although the voltage seemed roughly the same as the rest. I took everything apart around the hybrid battery to see if I could find a smoking gun, but the most I saw was some corrosion on the nut fixing the wiring harness to module 9 and some corrosion on the bus bar. (see pics). I cleaned the nut and stud up, hoping it would fix the issue and put it back together. Couldn't find the torque wrench, so I estimated the torque spec (48 in-lbs) by putting it to roughly the tightness and amount of threads showing as the nuts around it, which I did torque to spec several years ago.

So I put it back together and drive it around for a few days until I get more codes. First P0AFA, then P3019 again later. Now bank 9 still has the higher internal resistance, but bank 10 and 11 slightly lower voltage than the rest and keep switching back and forth to negative in the dr Prius app. I took the nuts off of 8 and 10 in addition to 9, but not 11. I don't know where to go from here, but I'll post some pics and I would love any advice you guys may have. Thanks!

 

Thanks for the suggestion, but I’ve already checked all of the plugs going into the battery ECU. That was the issue the first time, but this time all the pins look good, zero corrosion. Don’t have any pictures because I already put everything back together and have been driving it, but it’s good.
I think replacing module 9 may be necessary??? But I’m not sure why 10 and 11 are going into the negatives on dr Prius.

and the bus bar was replaced about 4 years ago after the leak had been sealed off, so it should hopefully not be leaking. I was just a bit worried about it because parking a car outside where I live is a bit like leaving it in a running car wash, so it’s very plausible more leaks could have sprung up.

also forgot to mention the 12v battery was replaced about a month ago.