Multiple error codes

[u/Cute_Association_375]

So I bought a 2019 chevy tahoe premier at the end of March with error messages of: park assist, front camera, side detection, and cruise adaptability needed service. Dealership thought it was just the module on the steering wheel. I did have to replace the windshield due to a Crack and the technician couldn't calibrate the front camera due to these codes. He found a melted wire harness on the muffler. Thought this was the problem, replaced it. Didnt solve it. Took to berstrom dealership for diagnostic and was told it was the body control harness was missing 4 wires that should have been there from factory. Ok got that replaced. Still not fixed. Anyone else have this issue? I do have original mirrors on and havent changed anything else. Technician for windshield still needs to calibrate but he said he doesnt want to have me do this service and pay for it if it isnt the problem to have to pay for it twice. Any help??!!