Brake Actuator Warranty Extension - Seeking Advice

Looking for advice on how to handle a situation with Toyota and my dealer. Any help is appreciated.

My old 150k+ mile, '06 Prius's brake actuator is/was covered under a Toyota Warranty Enhancement Program ZG1 through December 31st, 2017, regardless of mileage.

It started exhibiting symptoms in late December, and I brought it into my local dealer (Butler Toyota in Indianapolis).

They said that since the 12V battery was low, they couldn't get the right codes out of the system to verify the issue was with the brake actuator and could be covered under warranty. I paid them to replace the 12V, and they said if the symptoms came back, to come back.

Then, on December 31st, it happened again. I called Butler Toyota immediately and left a message (not open of course, New Year's Eve). On January 2nd, we set up an appointment for the 8th.

Now, Butler Toyota has verified that the Brake Actuator is the issue, it is throwing the right codes. But, the extended period is over. They made a request to Toyota to repair it, since they saw the issue before December 31st, but that request was declined by Toyota.

They had me call Toyota and request an investigation, which they have done, and is underway. I'm not sure how an investigation will help, since none of the facts are in dispute.

Any idea what to do? If this issue isn't covered under warranty, what is the least-expensive way for me to get it fixed? This car is old - I really don't look forward to a $2k+ repair bill on it. That might just make it time to get rid of the car....

-->Adam