Probably not the same cap again and a complete recap would be optimal.
Anyway, there is a pair of caps on the top PCB, often
black radial ones. They are 220uF/10V, I think, and
slightly underdimensioned - often fails.
The cap kit contains 40V components for these positions if
I remember correctly but 220uF/25V will also work fine.
The problem is that the 8V reference voltage has gone.
There can be other reasons for this though the above mentioned
caps are to blame in most cases.
I replace these on all machines coming here as a matter of cause.
Martin