I pulled the door handle off, and found that the resin that seals the electronics into the comfort handle is what had melted.

I also found that fuse 132 had blown, which meant I had a warning on screen about the acoustic alert system being disabled, and the stereo system and PDC warnings would not work.

I ended up swapping the faulty drivers door handle with the one from the rear door (I don't care about comfort access not working on the rear door) and just leaving the faulty handle disconnected from the wiring harness. I then replaced the fuse and now everything is working fine, including comfort access on the drivers door.

The melted resin easily cleaned off with some citrus based degreaser.

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