New (concerning?) sounds on my 2nd Gen

2005 Prius 299999 miles (actually around 360,000 by my estimation)

I am experiencing some new sounds from my Prius coming from my lower dash area. The first is a barking sound from my brake actuator, and the second is a whirring sound when I accelerate that is louder than usual and only heard on some accelerations. It disappears when I press the brake. It seems like it could be coming from the inverter area, but I am curious if any people here have any experience with the sounds I am hearing.

I checked my inverter fluid and that was a little low, so I topped that off. I'll be watching for any fluid level changes. Brake fluid level seems okay.

This car has been the most BAMF car I have ever owned (I value dependability and fuel efficiency), but I fear the end is near ever since reaching my 299999th mile. I am comfortable with pretty much any repair after following the PriusChat step by step transaxle swapping post successfully several years ago, so I am open to any suggestions and/or tough love. Thanks to all of you amazing members who share your knowledge and experience!