The Quadfather

I recently picked up a minty condition Pioneer Quad 949A reciever. Apparently I can use the term minty condition only to it's physical shape. This is one beautiful unit. It actually functions perfectly on all channels, pots, etc.
My queston is just that when I press the power button I sometimes get it to fire up, and other times there is no power at all.
Then sometimes if I press the power button in and out 4 or 5 times, it will come on. Other times it will come just fine in one push.

What does this indicate? I want to say a short somewhere.... but it's not like I'm shaking the unit and when the short circuit makes connection it works. It just decides on it's own when it will work.