Thanks for the info - I'll check in with SD and see what the deal is these days r.e. the upgrade. I've owned it since new for ~12 years and am wondering, if I do send it in, is there any sort of maintenance or other work I should consider having them do as long as they have it? It's always worked flawlessly but just wondering if any sort of routine cleaning, maintenance, adjustments, testing etc. might be advisable or necessary?