Wow! It's been a while since I worked on one of those. As I remember, what JCFitz is right. Lots of soldering (especially those big chokes). I also sometimes saw bad connections where the cables attach to the edge of the board. make sure the contacts aren't gunked up, or broken off. I doubt you'll ever find a 2-section cap for the B+ filter, so probably need to use 2 seperate caps.
19" with spacephone? Is that SY1963W?
Back in the late 80s I used to have a lot of trouble with the rebuilt modules failing soon after installing them. I had one guy who called me back 4 times in less than a month, each time the 9-160 failed, and a different failure each time, and I'd put in another one, and a few days later, *poof* again. Almost quit working on Zenith after that. It got so bad that I wouldn't install one until I'd resoldered the stuffing out of the new module myself.
I seem to remember a diode near one corner of the board that occasionally failed because of heating in the cracked solder connections. Maybe I'm thinking of another board.