@irepairgso, Ah, the dreaded thermalmonitord boot loop.
Mic2 is a sensor connected to the power flex assembly, and you have to replace the assembly to get rid of the boot looping issue.
***NOTE***! If you can get an OEM pull, that’s the best, but high quality aftermarket ones also work. Only trusted vendors like iFixit themselves or those who do real quality control inspections should be used.
Most, if not all, of the cheap-o vendors are missing a lot of the sensors etc. and it will continue to boot loop even after a replacement.