Finding complete boards for any of the reef equipment is nearly impossible. I do occasionally buy complete lights for parts and recover what I need from them, but even those are an extremely scarce resource. So instead, I do component level repair, as individual components are much easier to come by.
This connector board has almost no components that can burn out due to water damage. It's probably salvageable with some rework.
If it help at all, check out my recent repair post. It is specific to the Hydra 26 HD where I repaired the connector board, among other things. But the main problem was on the mainboard:
Some of my previous repairs: https://www.reef2reef.com/threads/radion-xr30-shuts-off-at-high-intensity-on-blue-channel-repair.813624/ https://www.reef2reef.com/threads/another-attempt-at-fixing-apex-eb832.804717/ https://www.reef2reef.com/threads/radion-xr30-complete-no-light-repair.792711/...
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