Apologies for the lazy post, but I've not had much luck searching. I'm just getting back into the hobby after a break of about 10 years. I've updated the Elite's firmware, and thought it best to check the state of the locos before I started anything else. I set up a programming track, and tried to set up all the addresses, but only 6 of them appear to work. When I tried to read the address, after writing, about 10 of the locos just had XXX in place of the number. Hoping that others who've encountered the problem will also have found a solution. I think 5 out of the 6 that currently work have R8249 decoders in them, so those not yet working are a mix of R8249, R8245 & some unknowns that were either factory fitted, or by the previous owner, for a couple of 2nd hand models. All but 3 of the locos have spent the last 10 years stood on pieces of track inside display cabinets. Not sealed, but reasonable dust excluders. I've given some of the wheels a bit of a clean, mostly using isopropyl alcohol on a cotton bud. The track I went over with a rubber, then wiped it with isopropyl too. Any suggestions on the likely problem/solution would be very welcome, as I'd prefer to fix all the locos before starting back on the track-work. As a side note, I had a quick look at wheel-cleaners, and wondered if they're generally considered a good addition to the maintenance cupboard. The two I've looked at so far are Woodland Scenics' & Guagemaster's.