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  1. Greetings everyone! I am seeking the knowledge of someone very familiar with the internals of the MacBook Pro with Touch Bar (15”). Last week, a crackling sound began to emanate from the left side of the MacBook. I ultimately took it to the Genius Bar, and I picked it back up this week after one of the fans was replaced. Unfortunately, once getting it back, a new problem became evident. Specifically, the Touch ID sensor is not responsive. I went through the following steps to try to troubleshoot: 1)Shut Down/Restart 2)Deleted a saved fingerprint, tried to add a new one (nothing happens when I LSU a finger on the sensor). 3) Reset the SMC and NVRAM. After rebooting, still not working. 4) Backed up, then did a clean re-install of the OS. When prompted to set up Touch ID for the first time, it is still not sensing the finger. Having gone through these steps, it sounds like I have no choice but to return to the Genius Bar (80 miles away). This situation has caused to wonder what exactly could have happened during the fan replacement that led to the Touch ID failure. I am certain the sensor was working prior to the Mac being serviced, so it is most likely this new problem was a consequence of the fan replacement. Does anyone know if the pathway to replacing the left fan requires acessing, removing, or otherwise manipulating the Touch Bar or Touch ID sensor? Everything else on the Touch Bar is working just as well as it did since I’ve had the Mac. Thanks for reading and in advance for any insight you may have.