Vortex Sound Research

Hi all!

I have recently picked up an EXTREMELY cheap Roland RD300s that has evidently been packed away for many years and had to be cleaned up a fair bit to get running.

I seem to have every single thing including every button, slider, input, output, etc. working aside from one key. My D3 key seems to be having issues sending a signal to the circuitboard. I have wiped all other key contacts down thoroughly (but not too thoroughly to avoid rubbing the carbon contacts off) but am still having no luck with this one key.

Below is a linked photo of the contact board of this key. Wondering if anyone can identify what the issue I'm having might be and how to fix it?

https://drive.google.com/file/d/1F6UYDj8Ecdt4OIUBYm0aKKpMbAmdL7j8/view?usp=drivesdk