If you're still looking, there's no official cap kit, just order the caps yourself. I have composed a list a while back:
Amplifier Board (Nintendo only)
C375 - 1uF 50v
C371 - 4.7uF 25v NP
C378 - 220uF 25v
C377 - 10uF 160v
Neck Board
C254-256 - 47uF 25v
Main Board
C609 - 470uF 10v
C610 - 1uF 160v
C410 - 47uF 160v
C484 - 330uF 25v NP - Can be hard to get large bipolar caps now days. Replaced with 470uF 35v NP as closest I could get, works fine.
C471 - 10uF 160v
C408 - 4.7uF 25v NP
C462 - 100uF 160v
C474 - 330uF 25v
C475 - 1uF 160v
C406 - 4.7uF 160v
C207 - 1uF 50v
C208 - 47uF 16v
C205 - 220uF 25v
C166 - 1uF 50v
C162 - 4.7uF 25v NP
C161 - 220uF 16v
C479 - 10uF 16v
C460 - 1uF 50v
C453 - 1UF 50v
C455 - 1uF 50v
C202 - 220uF 16v
C457 - 100uF 25v
C206 - 4.7uF 25v NP
C211 - 100uF 25v
C606 - 470uF 160v
Whilst you're there, do yourself a favour and sort the PSU out as well:
330uF 200v x 2 - short and fat about 3cm dia, 3-4cm high MAX
2200uF 10v x 8 - ~1.5dia, 2.5cm high MAX
470uF 50v no bigger that 2.5cm MAX, 1.5dia
470uF 25v
10uf 50v x 4
47uf 16v x 15 (upgraded to 25v) - all in top level
It will then happily go for another 20 years

Remember to have a fiddle with the +-5v pots on the PSU when done.
Hope that helps
Andy