In case this is helpful: Form 2 Heater Cable Repair
I included some links if you search that page for the phrase “unofficial resources”; one of them is the video you already found which is probably your best bet in terms of procedure.
If you ask Formlabs they will tell you the printer needs to go back to them for recalibration. I expect if you’re careful and patient enough you may be able to restore acceptable performance… but be prepared for it to take some time and iterations.