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@oxpoleon
I'm going to shamelessly steal snottyotter's picture because it shows a dérailleur identical to mine in pretty much the right position to explain the problem. Also, I lack a decent camera currently. Or suitable lighting.
My beloved 1st generation Record dérailleur has developed (or at least, I've just found) a hairline crack. It's on the body, where the hex bolt holding the jockey cage goes. Pretty much the highest point visible on this picture. It goes about 1/2 of the way across, parallel to the bolt (i.e. perpendicular to the plane of the bolt head), starting at the back.
Should I be worried? Is this harmless?