DS412+ Solid Orange/Flashing Blue error - C2000? Where to solder..?

One of our old DS412+'s failed to come back on after it was shut down as a precaution during a power outage. Seems like it's the classic C2000 error, given its age.

I intend to replace the CR1220 battery anyway, but if I were to do the 100ohm resistor fix, where should I be soldering it? The board layout is different to most of the videos on the internet, which deal with the DS415+.


All help appreciated...