When troubleshooting, I have found over the years that what you just did before the problem showed is what caused the problem NEARLY every single time.
You changed the fluid from what was working to what isn't working. I would look very hard at that as the source of the problem before replacing parts.
Why would the seal, or relief valved have caused the problem? Not saying they couldn't but why immediately after changing the fluid to a non stock oil? Do the oil flushing and replacing before going further, and the NAPA stuff sounds a lot cheaper.
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