Porthole Audio Problem

[bgadow]

This is a Zenith model 28T925-R/ch.28F20 (sams 64-15) that I got running a couple years ago. It used to have good audio but now I can only hear a whisper. More than once I've heard this blamed on bad caps in the audio section (silver mica?) and am wondering, is there a specific one or two that usually go? I will probably need to order them and was looking for a shortcut if I could find it. (I have to order some others, would like to do so before next week when I am going to get busy)

(note that all paper/electroytics are replaced already)