Unfortunately those are factory... I would play it by ear (or eye, in this case) and add a dab of solder where the joints are sketchy. Refurbs can be just as bad - sometimes worse. We have had a few members that have had dud ECM's that had refurb stickers on them (really crap solder jobs...) Clean the board with isopropyl alcohol and a small brush to gently scrub the crap off the joints and use liquid flux before touching up the joints. It would be ideal to use a de-soldering iron before doing the patch up but if this isn't something you'll be intending to do again in a hurry, it's not worth the investment. You can do this no problemo - just be thorough and use a small tipped iron for control. I'll add a video just for the soldering content -

https://youtu.be/5Pxuf94fdRQ?t=326 (this guy is pretty good and the UHF radio that he's repairing is similar in construction and lay out to your ECM)