I think my 727 is fried. Now I'm at a crossroads...
I replaced the clutches in the forward drum, and I found out the reason they were able to fit four is that they are much thinner than the replacements I got. Wouldn't fit with four, but fits nicely with three.
I don't know why I was so afraid of opening up the valve body, it's really not too bad if you're organized and clean. And obviously I'm not terribly organized or clean...