While we're on the topic of sublists, does anyone know how to access the lines of a sublist that isn't a field? I have child records on an item, and I can access the sublist with

var sublist = newRecord.getSublist({sublistId: 'recmachcustrecord_sc_product_image_parent'});

, but I get

Cannot find function getSublistValue in object sublist.Sublist

trying to get the individual items in the list.