[Arran]

If there is a resistor across the filament winding going to the #45 tubes that is a hum balancing resistor, if it isn't open leave it alone, the placement of that tap was set at the factory to match that specific set. I would forget about exact resistance readings on the RF coils, the main concern is continuity, no open or extremely high readings.
Anyhow I would download that PDF of the factory service folder from that site, print it off, and then study the schematic and wiring diagrams thoroughly, it will answer a lot of questions you may have.
Regards
Arran