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Worked on the horn replacement this morning. I did have to take off the apron under the front bumper to get to the horn. You can't even see it from on top. Luckily I had a 13mm GearWrench ratchet box end wrench. The bolt attaching the horn is on top of the brace piece and in very tight quarters. When I installed the new horn, I just mounted the horn strap and bolt from the bottom so it was easier to work with. If it works loose for some reason I'll just put a little locktite on it the next time I have the car on a rack.
This is a poor design by Mercedes since the horn location causes it to get a lot of water resulting in failure. A photo taken from underneath after the new horn was installed is attached.
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