Hopefully its an easy to access O-ring. I'm pretty sure I filled it with dye oil when I had the engine out, flushed all oil out of the system to get proper amount of oil. Pretty sure I also replaced all the O-rings in the system. This is the one with ~11k miles on it, so bearings and such haven't just gotten totally worn out, but other things like the front shaft seal, are 25+ years old. If a hose had a pinhole leak that wouldn't be the worst repair, I have a hose crimper and some leftover hose and ferrules if they are the right size. Mostly just annoyed I have to do anything since in `2016 when I had the engine out I spent a bunch of effort on the AC system to do it "right" which may or may not have contributed to the problem. Things like aftermarket o-rings can always be of questionable quality.
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