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MrFixr55, thanks for the confirmation on those points.

As for the potentially open resistor R15, since that is a segment of what appears to be one large single component, what would be the way to repair this?  Does the entire voltage dividing resistor need replacing, or can the existing piece be modified/supplemented with an appropriate replacement?

I'll pull the chassis back out of the cabinet to check the readings on R5 and R7 as you described before placing an order.  If the readings come back poor, is there any best practice for removing the shields around the transformer since they are riveted on?

Arran, thanks for confirming the existing electrolytics are not factory original.  I will make sure to match the replacements with the values specified in the schematics.

Best wishes,
Roy