[Arran]

Dan;
  Is this set a 37-116 or a 37-3116? The reason I ask is that the Canadian set may differ in some ways from most of the U.S built versions, but match up with others depending on the production run and Code number. From what I have heard, never having actually worked on a 1937-38 vintage Philco, is that the chassis are modular, they are made up of sections with plates and screws holding them together with wires connecting the various sections to each other. So to gain access to things you can remove plates and even whole sections if you have to. Bob Andersen's 37-640 restoration series was very enlightening in this respect.
Regards
Arran