Mark, I had an issue that sounded like yours...... All bands would output what they should ie 100w with the exception of 6m. I wound it up in the settings and still couldnt reach 100w for 6m I later heard a bang then some smoke mid way through a contact on 6m - thought the worst. Pulled the 100D apa...

I have been out done.....

Well done on your solution Philip. Extraordinary transplant.