P0A80/P3000 at 75K/14 yrs

My beloved low mileage 2007 threw the dreaded codes and the christmas tree of lights...

The codes were pulled by a local shop, not the dealer. From reading posts here, the likely culprit is a bad cell (or cells?) of the HV battery pack.

Question: Are there other possible culprits that would make it worth getting the dealer to diagnose it, or is that just throwing away good diagnosis $$ since the cause is pretty much known?

I'm not capable of doing my own cell-by-cell diagnosis, nor of replacing the battery pack myself, so my options are more limited.

I know that the battery pack replacement at the dealer could easily run in the $3K range.

I guess my questions are these:
(a) The car is low mileage, and should have a lot of life in it as a vehicle, but the car IS 14 years old. Is it worth putting in that kind of $$?
(b) I have read a number of posts here about asking the dealer to call Toyota about a "goodwill warranty" based on low mileage, but I'm way past the 10 year warranty period. And no, I haven't had my service done at the dealer.

 

Thanks. Is it safe to drive a distance to a different dealer?