That cap looks like it is same value of immediate adjacent one, 2000 uF ?
When a cap blows short it draws a lot current, usually taking out other
components. If this cap is a part of power supply then it may have taken
out one or more diodes. Although I must admit if scope still working,
has correct voltages and ripple on supply rails, then I would be at a loss
to describe why other components were not also damaged.
Another frequent failure in old scope are carbon composition resistors that
change their value. So you might go thru scope and measure them as well.
Lastly controls get very noisy, use a good cleaner on the switches and pots.
Deoxit one of the best.
The scope vertical attenuation/gain switch is in volts/div I am thinking, so
you should be on 1, and using a 10X probe, so that you can see the 14
Vac signal. A 10 x probe would give you 1.4 divisions of observable
waveform, if your 14 V is peak-peak.
Regards, Dana.