Thanks for the info, Wayne. I'm in the middle of doing those mods on mine right now but before I go any further, I have a question.
I have one of the earlier versions (board Rev A) which (of course) has a completely different layout to the current one shown. Would I be correct in assuming R22 and D1 have the same functions, and I just connect to those numbered components as described?
That is, the 19.3 ohm resistor in parallel with R22, and the external power positive lead to the cathode of D1, as they appear on my board?
I'm pretty sure that will be the case, but thought I should confirm. I'd hate to wreck one of my favorite and most-used tools.