I have decided to bite the bullet and do my own re-flash of the module. Progress so far is module removed, opened and no overheating visible
Have ordered the bits needed and some new copper foil as mine came off but in several bits. Will also renew heat -sinking. On the underside of my lower board was a large rubber sticky pad attached to the larger chip .I have not spotted that on previous photographs. Will post results good or bad.
