C1391 With Warning Lights - Techstream Verification

Howdy All, 2010 Prius with 115k miles on it.

I got an almost full Christmas tree yesterday, namely the brake light, traction control light, ABS light. Brake pedal is harder than it was before. I have been hearing a slight 'hissing' noise inside the car recently, from about where I think the actuator? is, and the accumulator? runs every five to ten seconds when I am just sitting. I do have a techstream, and verified I have code C1391. Based on the noises I am hearing, plus perusing these forums, I believe that I need to replace the actuator (thingy mounted to the firewall). There have been some forum posts saying you can use techstream to individually toggle valves in real-time to verify if things are stuck or not, can anyone verify this, and possibly post some instructions? I will be monkeying around with it tonight, just could use a shove in the right direction if one is available.

It wont let me link the document, but its the ZJB Customer Care program thing that covers this problem, and covers my car for 10 years from first drive, or 150k miles, whichever first.

Happy Fathers Day to any dads as well!

 

EDIT: 155k Miles on it

 

Yeah, its driveable for now ish. Not entirely sure how safe, but the dealership is about 5 miles down the road. I will be calling them in the AM to see if they can do anything, but I have been scouring these threads lately and im betting they will be asking for ~4k to just replace both. So we shall see.