[Ron Ramirez]

I think you're absolutely right, Arran.

Let's consider which components are band specific - and that would be only the trimmers for each of the five "spread bands" (31M, 25M, 19M, 16M, 13M). So whatever is causing 31M to not operate properly - and causing 25M to not work at all - must be limited to components for those individual bands, and that leaves the trimmers for those bands.

The permeability tuning for those five bands use the same coils; different trimmers are switched in by the band switch in parallel with these coils to make it work on the different bands.

It's beginning to look like I am going to have to remove the RF assembly, which appears to be removable - but does not look to be an easy task.