What an M156 (63 AMG) ECU/computer ruined by a tuner looks like and how to fix it
We are not going to name any names here but chances are there are a few M156 ECU's out there that look exactly like what you see here. This ECU was drenched in epoxy gunk which essentially ruined it without the owner knowing or providing consent for the ECU to be modified in this manner. The only way to remove the material to be able to tune the ECU was to use a CNC machine carefully to remove it over a period of a couple hours. It was a coin flip whether the board would be hit essentially creating an expensive paperweight but the ECU was able to be salvaged and tuned as the material was removed without hitting/damaging the board. Make sure you do not have to go through this ordeal with your ECU and be careful what tuner you go with.