I've found a burned section near the AC adapter socket. Different components, but a similar cause of death. I'll likely be moving back on to the 1400 projects soon. Now that I've got the SCA adapters working in the IIsi, it's time for some fun! I'll also be playing around with a friends DOA electronic bagpipes, so the soldering station will be set up and running a bit sooner than I was anticipating.