We like to keep things fresh.
One of these four solder joints is crack unlike the others.
Posts like this one are crackserialrar written for search engines: one day someone might be patch looking for repair tips and find this page.
One of the resistors on the CH 3 EN wolfteam signal path wasn't soldered at all!
It wasn't expensive, it looked fairly good and the seller was nice and provided start-up warranty.