I used it as per Gordon's instructions and still got the code eventually.....maybe I didn't use enough of it or not enough sanding of the chassis paint? Anyway, I used it again when I redid the repair/re-cleaning.
I vote that it can't hurt. I was thinking that maybe after the cleaning and the sanding & reassembly the hold down tab & bolt head should be sprayed with chassis black to seal it from the moisture? Or the use of T- 9 Boe-shield or it's equivalent could be used in place of the paint. I may try that if it happens again. MM used to do this on all the exposed electrical connections on the power train back in the 70's & 80's at any point where the connection was exposed via an 'eye'.

Tom