I decided to clean the bus bars on my 2008, Prius. I used vinegar and sand paper. There was a lot of corrosion. I got them all put back on and the bolts on and now I am getting a P3000 code after driving 15 or so miles. I am not getting any other codes. However, my fan did start blowing harder and there was air coming out of the holes on top of the battery. The car still drives. When I tested the voltage on the battery cells they were all consistent at 16v in the middle with the two ends being 15v and 14v. The car is at 207k on the original battery. What are my next steps?