The first time I ran into this a massage therapist asked if I wanted her to work on a small but noticeable divot in my upper back from the not-very-skillful removal of a questionable mole. I can't reach the scar myself, but she essentially moved things around enough in one session to make it less prominent, probably because it was in a fleshy part of my back. I also used it on a scar from surgery to remove a ganglion cyst on my wrist, and it's now barely visible unless I've got a deep tan.
I'm surprised your PT doesn't know anything about it; maybe your surgeon can recommend someone more knowledgeable. Meanwhile you can fool around with it yourself, because it's not complicated: you just want to stretch and loosen the scar tissue so it doesn't distort the tissue around it, which simply means moving it around until the area softens up. Use some lotion and work on it for 10-15 minutes once or twice a day. It'll probably feel weird at first, but take your time and you'll see progress.