The most efficient way to find out where shorts are occurring is by pulling components one-by-one until the short disappears (using a thermal camera can also sometimes help speed up the process), but that can just end up taking a huge amount of time and it requires special skills with a hot air rework station which people may or may not have. Then if you do find the component that is causing the short you have to source a donor part, and if that isn't easy if there is no ID marking on a component and no schematic (which you will never get). And if the fried component is the MCU for the FET gate drivers on a BLHEli_32 then it is pretty much game over because those are pre-flashed with manufacturer licensing data that you will never get on a donor MCU unless it's from another ESC board of the exact same type.

Sometimes you just have to cut your losses unfortunately and throw it in the parts bin. Some of the parts on it may come in useful for repairing something else in the future.

Yes, you are right. I already got another ESC and finished the build. I justed wanted to learn more. The main issue I've faced with the process you described is that it is really hard to remove ICs from the ESC board. I can easily remove ICs from FCs or other electronic devices, but no way for my air station to remove ICs from ESC. I connected this to the thick ground pad in ESCs. Anyhow, I don't think I will dig more on this. I can except if I had a really professional and strong air station.
I also went through comparing values ICs in the burn ESC with the working one and I could not find the main reason.
I think that's it for me. NO PLAY WITH ESC ANYMORE.