That repair looks like it requires equipment and SKILLS not in my collection. But more fundamentally: how would I recognize that this soldering was required? Do a lot of the cloned units need this? Is there a source which might be better than others, or must each buyer try it out?

Thanks for excellent information! (Now I have to confess that I must go back to read through this whole thread. But the possibility of having a completely functional DRB III for this price range is delicious!)