Hi Julius and Dan,
Julius, I have a copy of the SX-28 manual from BAMA and the military manual for the AN-GRR2 (Military SX-28A) which at least has a resistance chart. But with the varnish and tight cable bundling it is very difficult to trace anything unless it goes directly to a tube socket. Even most resistors have no useful color coding as they two were varnished 75 years ago
Some resistors I can psych out as being good, by tracing the schematic and finding 2 points unaffected by other items that allow me to test. But as we all know components are often not near a logical spot
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Dan, I checked that service bulletin, but it does not list any component locations.
Thanks to you both