My shutter count obsession hid a $45 mirror box problem

I spent three evenings chasing a clicking noise on a Canon EOS 5D, convinced the shutter was about to die. Turns out the mirror box dampening foam had turned to sticky goo, which pulled the mirror mechanism out of timing. A local shop in Portland fixed it for $45, but I felt dumb for checking the actuation counter first. Has anyone else had foam rot mess with their diagnosis flow?

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