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Update and closure on this thread - for the moment. On the off-chance that an SRS fault might result in a failure of the air bag system when/if needed, OR, a chance misfire on the road, I opted for a system read at my dealership. The scan threw two codes - one a hard fault in the front pax seat belt catch, the other a "plausibility" fault (there's a new one for me) on the clockspring. i elected to replace the seat belt catch - it was becoming difficult to manipulate anyway - and decided to hold off on the clockspring pending further fault indications. No further messages ref. SRS, so my comfort level is up several points. An expensive exercise, no question, but when you're driving a tank, you might as well have all the armor buttoned up, I say. Thanks to the contributors to this thread - y'all know how important that part of it is.
Garth.