47-55 1st series is the "Advance Design" model, 55 2nd-59 is the "Task Force" model, anytime you ask questions it's useful to know which you have
noises from in the door could be various different things, from the padding missing between the relay arm and the finish panel, to the channels having worn out felts, to the lower sash channel screws coming loose, but if the window still goes up and down reasonably well it's unlikely the rollers are worn enough to rattle ... need to start taking things apart and find out
Bill
