hifi engine

Yamaha CR700

I am resurrecting one of these beauties, rescued from a VERY wet home, nearly there, but desperately need a service manual, an owners manual would be nice as well. I cannot find anything for this model anywhere.
Perhaps someone here who knows Yamaha products well can point me in the direction of another chassis in the series with the same basic circuitry, but different power outpu? My AF output section is OK.
Many thanks in advance