BrAKE Squeak

2013 C at 35k miles with brakes squeaking when letting up on peddle after moderate braking event, same squeak occurs a minute or two after the vehicle is turned off and the pump depressurizes. Had dealer check for if last time I was in, but they could not duplicate issue and surprisingly I could not either that day. Still occurs regularly.

Seem to be some similar issue threads on the liftback, but I don't see anything on the C regarding this. From what I'm seeing in the other threads it's likely either just needs a flush or a whole new actuator.