Before doing this we recommend unplugging your machine and allowing it fully cool off. Tools required:
Start by removing the top plate (#2 Phillips driver) and side/back panels (10mm wrench).
Disconnect thermal probe wire harness, you may need to remove a couple zip-ties first.
Using a 17mm wrench, remove thermal probe.
Install new thermal probe using a thread sealer such as teflon tape. Reassemble and test machine.