So I took the nut off of the bypass valve and replaced the o-ring around it with a HNBR o-ring from an assorted pack from Harbor Freight. Hopefully, that will stop the leak. I chose that type of o-ring due to its higher temperature range, but it looks like the one I replaced was a run of the mill rubber o-ring. The HNBR o-ring was harder and less elastic. I wonder if I should have just put a regular rubber o-ring in instead.
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