So I replaced my AOS today because it was driving me crazy when I see blue smoke on startup. It took 2 hours to do so it wasn't all that bad.
My old AOS actually looked fine and didn't have any signs of a leakage and the old part number ended with .03 (.04 is the new one) so I may have wasted a $100 but what the heck... I bought a new J tube but didn't need to replace it.
Hopefully, no more pufs of blue smoke on startup!
-Steve