Javascript to determine named fill/stroke color of pathItem[index]?

I'm attempting to build a preflight of sorts for my Illustrator workflow (since for some reason.. preflight in illustrator doesn't exist...).

Essentially i need to loop through the pathItems on each artboard looking for a specific spot color (first verifying that the spot color does NOT exist as a fill color in any of the artwork, then checking for the presence of any pathItem that contains the spot color as a stroke).

This seemed to be a really straightforward task, but it seems as though pathItems.fillColor or pathItems.strokeColor is not a valid property? That confuses me because it works to apply a color to a pathItem.. It seems to me if you can apply a color via pathItems.fillColor, you should also be able to create an if clause that determines whether pathItems.fillColor == (some color). However, while testing this in the simplest of documents wherein i know what the result of the if clause should be, it doesn't work. is there something I'm missing here about the property fillColor/strokeColor??

Here's the code I'm working with. Thanks, all.

#target Illustrator




var docRef = app.activeDocument;
var aB = docRef.artboards;
var swatchList = docRef.swatches;
var tC = swatchList.getByName("Thru-cut");
var tCCount = 0; //how many artboards/top level groups contain at least 1 Thru-cut stroke?
var artLayers = docRef.layers;
var groups = artLayers[0].groupItems;
var aBtCCount = 0; // how many artboards have
var aBnoTC = []; //  which artboards/top level groups (by index) do not contain at least 1 Thru-cut stroke?


for (a = 0; a < aB.length; a++){    aBtCCount = 0    var items = groups[a].pathItems;    for (b = 0; b < items.length; b ++){        if (items[b].fillColor == swatchList.getByName("Thru-cut")){            alert("You have Thru-cut fills in your document!!");            break;            } //end if // thru-cut is fill        else if (items[b].strokeColor == swatchList.getByName("Thru-cut")){            tCCount++;            break;            } //end if // thru-cut is stroke        else{            tCCount = 0;            } //end else // set counter to 0        }//end for loop B // checking items on each artboard    if(tCCount == 0){        aBnoTC.push(" " + a);        }//end if // artboard has no cut line    else{        aBtCCount++;        }//end else // add to counter for total artboards w/ thru-cut    alert(tCCount);           }//end for loop A


if (aBtCCount < aB.length){    alert("Artboard/s " + aBnoTC + " are missing Thru-cut lines");    }//end if // not enough cut lines