Piano teardown has continued this week and I was able to complete a few things:
Taking the action/keys apart, the keys were ceased to the balance rail pins.  Those will need to be replaced.  There is too much corrosion to use them.  Oh well.  That's another thing I'll have to replace.  A few of the balance holes were damaged, but nothing significant.
I started working on the finish.  It's a lacquer rubbed satin.  But with plenty of dings and chips.  This will probably be the most time consuming and expensive part to piano to fix.  I gave it a light rubbing to see how it would respond to different grits.  It's looking like an 800 grit pad will make it look nice.  Just need to fix all the chips and bumps.  

I removed the strings and started with the plate removal.  I noticed a couple things.  The string sized were all over the place, completely random.  There are no manufacturing markings for the gauges. So this piano had frankenstein strings up and down the scale, which contributed to the awful voicing & continued string breakage. I called Yamaha to get the proper string scale, and the tech dept emailed me the building specs.  Unfortunately, they are in the Japanese scaling, so I need to convert them to US sizing.  
Also, once I removed the plate, the pinblock looks very solid.  I had expected to find some leak-thru from a spill that happened on the tuning pins.  But, everything looks good and I'm glad to see I won't need to replace the pinblock.  I measured the torque before I pulled everything and it was within reason.  
There is a very small compression ridge that formed under the plate on the soundboard.  I haven't decided what to do about it.  I might dry the piano out a bit more and see if it's opens up then fill the gap.  From underneath it looks fine, which is why I didn't see it until after I pulled the plate.  ​