Battery drain + usb not working (hdmi and charging are OK) : what do?

Hello everyone, i’ll be brief :

• The Dock of myNintendo Switch fell on the sidewalk in the street, and the spring of the usb connector of the dock locked itself, I didn’t see it.
• I plugged the switch in the dock, but didn’t know its fall messed it up, it was kinda hard to plug it in, but I managed to finally get a signal on TV after 3 minutes of plugging/unplugging
• I think some pins of the usb-c port of the switch got hot-wired in the process (saw it after), but I managed to play for a few hours with a friend
• When I shut off my switch, and put it in its case to go back home, it started heating (symptom : battery drain + nowhere to exhaust the hot air)
• The USB function doesn’t work anymore (but with another dock, hdmi and charging are working great), the PC states “unknown HID device”, a USB device (such as SX pro) can’t be used
• The console can no longer be launched in RCM mode (black screen, that need a 12-second press on power to get out of).
• If i want to avoid the battery drain : sleep mode or power off are not enough, i have to press power button for 12 seconds.

I don’t have any equipment for soldering or dismounting the console, but before doing so, anyone has an idea of what component could be faulty, what i could test ?

Thanks

(happened 3 months ago, bought a new switch in the meantime because the French Nintendo support only offered me to change the whole motherboard for 240€, but if I could repair this one, it would be great)

French : le dock est tombé, ça a du connecter quelques pins du port USB de la switch quand je l’ai branchée dessus, et depuis, la switch n’a plus de fonction USB, et se décharge toute seule sauf si je fais un hard power off (12 secondes), impossible de passer la console en RCM, ou d’utiliser un dongle basé sur la techno USB. Que puis-je songer à tester/remplacer sachant que j’ai pas trop de matos ? Merci