Well finally got time to put this back on the bench.
Can't believe how blind I am. I missed R14!

Even found the exact matching 12k4 resistor in my misc resistors bin. Replaced the two 10 ohm soldiers that got liquidated as well.
Made a little test rig during the intervening months. I'll bring it up slowly to see if anything is getting toasty before I try it in my rack.
Also, I'm unclear on the 3 pins and shunt to change the output impedance.
The build doc totally skips these. I've notice elsewhere in this topic you said it was ok to skip for the previous Rev A version. I've reviewed photos of the 553F rev B internals online and it seems about 2/3rds of the builds include it. What does it do? Toggle between old school 600 ohm output impedance and a more modern higher impedance? Is it required for the output circuit?
Since I seem to be struggling with the DOA side of things, I went and ordered the DOA test jig that
FiveFish sells.
Hopefully I can get this all dialed in and crank out a couple more over the winter. Probably build up a few 528s for handling synths too.Though those look challengeful.