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Just my $0.02: acrid smells are almost always electrical - something burns up and you smell it for a while, but they do not last. And if they do then there is usually no question where they are coming from. Metallic smells are usually something that contains metal rubbing - brakes, bearings, etc...
Smells that come and go and last for months are usually paranoia. At the very least, and having been checked out by an Indy, I'd relax and let it play out. Chances are at this point that whatever it is will give you sufficient warning prior to complete failure that you'll have time to deal with it.
Good luck...
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