[maxhifi]

R6 is marked 100K on the board and is really 100 ohms
The tip of my pen is pointing at the dot on the transformer, on mine it's a little raised bump so much as a dot. I ohmed out the windings on mine before I installed it and noticed the dot after. The board has a corresponding dot. The next message will show solder bridges A B C and D. Presumably students would use them to measure current of the various sections as per the X's on the schematic as a troubleshooting aid.