Glad you were able to pinpoint the issue! I reused the old portion of my diverter valve when I installed the GFB, but mine wasn't broken. I'm not sure if there's a way to bench test the diverter valve to make sure it's functioning correctly, may be possible in ISTA or something. Guess you could use the old one as long as you're okay with it possibly not working and having to take it back off to replace again.
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