[RodB]

We're on the right track with the switches and oscillator coils. When in manual mode the oscillator uses the transformer 18 coils to oscillate and one of the tuned coils on the left when in push button mode. The two sets of slide contacts on the right side of the push button switches do this selection. You'll have to find them by identifying the parts connected to the terminals. As noted above the oscillator transformer 18 should have continuity in the primary and all three secondary windings. Make sure there is continuity between A5 and A3, A6 and A2, A6 and A4 when the wafer switch is rotated. Maybe hit all the switch terminals with a soldering iron and a touch of solder.