I didn't know that they made P.S. either!  It doesn't surprise me that whatever they make will be of good quality, they just always were in my mind a cab and chard shop, although I checked their site and they do have a zin, a riesling and a sauv blanc.
Found this on their site:  
https://montelena.com/wp-content/upload ... -Sirah.pdfFrom a later vintage, it at least details their thoughts on that varietal.  Now I am thinking that I might put a Turley on my drinking list, but that would be a far cry from the sort of wine you described.