I have a Nakamichi CR-7A that works and sounds great, but it has
developed a problem, and I am wondering how difficult it will be to
repair.

The flourescent meter window has stopped working.

I know a little about electronics, so I opened up the deck and checked
the voltages coming off of the transformer.

As expected, there were various different outputs of AC voltage,
including an output of 3.5v AC.

This 3.5v AC output feeds the flourescent meter window AND NOTHING
ELSE.

But this output has stopped working. No smoke, no fire, everything
else on the deck works perfectly fine. There is just no more 3.5v AC
output from the transformer.

QUESTION 1: What happened? Did the transformer have a meltdown or is
it as simple as some kind of internal fuse? (I should point out that
this deck's power supply circuit had been damaged at some point,
possibly by a power surge, but it was professionally repaired by an
authorized Nak repair center).

QUESTION 2: Can this be fixed - and if so, how difficult is it?

QUESTION 3: Will it be possible to find a replacement transformer?
For the record, this transformer has the following PAIRS of outputs:

3.5v AC (two of them)
5v AC (two of them)
15v AC (two of them)
18v AC (two of them)

Any help would be much appreciated.