[Arran]

Unless they are post war K-tran or Automatic style IF cans, the mini If cans used in millions of AC/DC sets from the late 1940s onward, leave them alone, Philco used either molder micas or ceramic caps in these sets I think, except for a large one used on the pushbutton banks.
The one on the P.B bank does go bad so I would change it, it looks like a sandwich with no case on it. One item to check though is the audio output transformer, the primaries on those often fail in these sets.
Regards
Arran