P0AA6 and P0B7C DTC help!

[Dinosaur_Ribs]

I'm hoping you guys can help me. I am getting the following DTC's

• ===BECM DTC P0AA6:00-08===
  Code: P0AA6 - Hybrid/EV Battery Pack 'A' Voltage System Isolation Fault
  
  
• ===BECM DTC P0B7C:00-0B===
  Code: P0B7C - Hybrid/EV Battery Voltage Sense 'N' Circuit

I had the coolant leak about over year ago and I followed Skyguy's thread and took out the upper pack (I did nothing to the lower pack), cleaned it, and reset the codes. Since then it has driven fine. I drive it around town and did nothing out of the ordinary before it threw the yellow wrench and red triangle. I park it in the garage and there was no rain or anything. I'm hoping it is a loose connection or something simple.
I have the full log files and can gather more information if necessary. Please help

 

[Heima]

Well, hmmm. Can you pull the drain plugs on the lower pack and check for coolant there? Or did you delete the battery cooling system altogether? Using Forscan, you can check the isolation resistance where it is measured. Do you have the service manual? If so, you can check the DTC codes there.
Service manual is here: