ddrum4 SE drum kit repair (maybe)

This ddrum4 SE was having very intermittent issues booting up. According to the owner, it'd only display garbage in the display. His on-stage remedy was to hit it with drum sticks, which of course implies a bad connection.
Several years ago, I fixed the same issue by simply cleaning the ROM socket. This time, we go further.
Like what you see?
Camera fund drive 2017: igg.me/at/ffco...
Good ol' Patreon: / ffcossag
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