So a standard cable needs to be chipped to show its rating to the device, its not that the device can pull what it wants or can get, but the cable itself tells it what it can supply. Extension cables can’t do that, because it doesn’t know what it’s plugged into, and that would be if they even bothered to put a chip in. They instead piggy back off the chip for the main cable. The problem comes when you you have a 240 watt cable hooked up to a cheap 120 watt cable, with the device being told it can push 240, and starts to super heat the extension cable

If you spent that much, but are hesitant about getting work done on it, try watching this guy. Sometimes it helps getting a look at the repair business. https://m.youtube.com/watch?v=ids3_Kxmi_I (this is just a random video, but he has some with refinishing) Or let it keep the ding, the first one is always the hardest with these things, but you got it to play, not the look nice. Accept life and its imperfections