2005 Prius C1313 C1377 Brake Issues

Hello, I am a long time Prius owner (im on my 4th one) but never saw the need to join, although I have used this forum many times to trouble shoot issues(so thank you so much!)

Anyways I have roughly 275,000 miles on this Prius that I daily drive and have had very little issues. Last year I rebuilt the hybrid battery and upgraded the 12v battery to an optima at the same time and its been trouble free since until this week. After leaving the car sit outside in the parking lot for about a week while I used a different vehicle, I finally went to move it inside and to my surprise the dash lit up and showed the "BRAKE, VSC, ABS, TRACTION" lights. The car seems to drive fine, although I noticed the brakes felt very stiff.

I scanned the codes and this is what I got:

Error codes:
C1313 Open circuit in Main Relay 2
C1377 Current capacitor

I did a search on here and found a plethora of things that could cause it. So I went through some of the typical things it could have been;

ABS No.1 fuse
ABS No.2 fuse
ABS No.3 fuse
Checked the Capacitor by the 12v battery
Checked the grounds by the 12v battery
Checked the orange HV battery connector to make sure it was locked down

I also went through the "DIAGNOSTICS – ELECTRONICALLY CONTOROLLED BRAKE SYSTEM" PDF

I did see some people mention that the harness can fail or mice can chew on the wires. Is there a common spot I can check for this type of issue? I would prefer not to pull the entire interior out to inspect the harness, but that might be my next step!

Any help would much appreciated!

 

No one huh?