OK, next! As I mentioned, I have two systems I'm working on, and I'm starting with the 11/23. It uses a Sigma BA11NL-1 chassis - very similar to the DEC chassis of the similar id. (Speaking of which... the chassis was in a box with a DEC "11L03-HA" label on it - I can't work out if whoever owned it upgraded it with the Sigma [which is Q22] or if DEC supplied the unit with the Sigma. I can't work out why DEC would have used an outside supplier for that - unless either i) Sigma could build a chassis much cheaper than DEC could, or ii) DEC was having supply issues, and turned to Sigma to fill the gap.) Anyway, so I've had it apart, and it's generally in very good condition... with this exception in the power supply: http://ana-3.lcs.mit.edu/~jnc/jpg/PDP11s/SigmaBurnedConnector.jpg This spade lug appears to be the +5V common, although I'm too lazy to check the prints to absolutely confirm that (there are two other similar wires coming out of the transformer, but without the white stripe of this one, and they both go to a honking great full-wave rectifier, the output of which goes to a heat sink (!) which appears to be doing double duty as a bus bar). Clearly, there was probably excessive resistance there somewhere, although it's not clear if it was across the spade connector itself, or in the wire-connector junction (note the brown spot on the insulating shield - I first thought that indicated that the wire-connector joint was the problem, but iff the spade connector got hot enough, the heat could have gotten into the wire, and caused that spot). So here's my question: what do I do? Do I: - Pull the spade connector off, clean everything well (e.g. with a Dremel wire brush), and put it back together, and hope? - Replace the connector on the wire side only (slightly tricky, as there's not much spare length in the harness, so I can't clip it off, I'd have to cut the old one off with a Dremel wheel)? - Try and replace the lug on the board too? (It looks like it got hot enough to melt the solder - the solder has the surface crazing to it.) That might be tricky... - Do nothing and hope (on the basis that it didn't melt down yet :-)? Whatever I do, of course, I should monitor it, and I'd like to avoid a lot of grief replacing things unless I really need to, but I'm genuinely uncertain what the best course is here. Thoughts?