Subaru Impreza AC / Blower / electrical failure?

Hello mechanics of reddit.

2013 Subaru Impreza, ~160k miles. Son was driving home from school, said he "heard a thing like something failed", and the AC light went out and blower quit.

We have replaced every fuse we can find related to the AC system (although none tested bad), the AC relay under the hood, the blower motor resistor, and the AC relay next to the blower...

The most success we have had is getting the blower to run only on speed 1 (which also got the AC to work), and then not every time.

Moving control to 2 or higher, the AC system shuts off, the blower dies, and we're back to square one.

Along with all of this, the check engine and traction control lights have come on. (My reader and torque app tell me it's a P0037 code).

Any thoughts on where to take efforts next?

Cheers.