Hi,
Ifixit does not do repairs.
It provides a forum where people can get free advice on how to fix the problem with their devices, themselves.
Anyone can respond with an answer that hopefully will solve the problem.
If no one responds to your question here, on what needs to be done to fix the problem with the MCU in your vehicle you may have to contact a reputable, professional electronics repair service or auto electrical service experienced in Tesla vehicles and ask for a quote.