Hey, So I just got all my parts to get FPV set up, and I decided to check my ESC's since I have had one minor crash a few months ago (I have flown many times since, no issues whatsoever). After inspecting my ESC's, I noticed that they have this white mark on one of the MOSFET's. Every one of the four ESC's has one of the MOSFETS branded with this white mark. It looks like some kind of sharpie or marker. I just wanted to make sure, since it could be a sign of overheating or whatnot. Also, does the soldering look a little cold? They all seem to have this sludge/clearcoat on them at times. You can see it clearly on one of the photos. It almost looks like water, but I can assure you it's not. Just want to be sure that my parts are good to go, the last thing I want is to see my beloved bird fall from the sky. Thanks in advance!