I just had a look at the diagram you sent. Thanks a million. Very interesting and I wish there was a breakdown of the audio board. By looking at the pic. I’d say they doubled the number of resistors in order to eliminate this burning issue. I may make a board from perf fiberglass using military silver/teflon wire for the traces. The burnt boards are pretty smelly to say the least and have to go. Let me see if I can now post a few pics from the desktop.
Many thanks again.