OK. Progress is finally being made: I modified the code as follows and now all repeater elements are displayed in the Lightbox with the exception of the IMAGE, which is an IMG_URL?
// For full API documentation, including code examples, visit http://wix.to/94BuAAs
import {lightbox} from ‘wix-window’;
$w.onReady( () => {
let item = lightbox.getContext();
let repimg = item.image_url;
let repdesc = item.description;
let reppart = item.oe_part_no;
let repcomments = item.comments;
$w("#CVPartImg").url = repimg; <---ERROR : 'url' does not exist on #CVPartImg
$w("#LBdescription").text = repdesc;
$w("#LBoepartno").text = reppart;
$w("#LBcomments").text = repcomments;
});