On close inspection of the pcb I found a few issues, there were a couple of small patches of corrosion. Most of it just needed cleaning but one spot it had gotten as far as eating through one of the traces.
I tinned all the traces in the area where there was corrosion and added a tiny bit of wire to the broken trace.
Then finished it off with a small amount of liquid solder mask. This fixed the background issue, all that was left to do was replace a broken resistor.
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