The air conditioning stopped working, so that was an emergency fix. After checking several points in the system, it turned out there was a secret blower motor fuse which had a hairline crack in it. This is a special-order fuse that the auto parts stores don't carry, so in the meantime I installed an inline fuse.
The transmission started acting up and was shifting poorly. Fortunately, this was corrected by a new, updated shift modulator.
Due to the high-powered sound system, the taillights keep blowing bulbs. But the reverse lights were no longer working even with new bulbs, so I replaced the neutral safety switch. The part of it that controls the reverse lights went bad. It would have been an easy job, but there's hardly any room around it and it's nearly impossible to get at the upper bolt.
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DON'T MESS WITH MY MERCEDES!
1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles