A probably-insignificant but still unexpected plot development - I wanted to put it back together enough to flush it so I scraped out the pipe with a battery terminal brush and stuck the otterstat back in, then pumped the pressure tester to 10 and it didn't leak this time. I didn't think the lumpiness I was feeling inside the pipe opening last time was really going to come off and there was another nick in the pipe that I hadn't noticed before so IDK why it was leaking like a sieve and took 2 applications of sealant to stop it last time. I'll run it tomorrow and see if the fans come on now if it holds overnight.

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