I actually had that as a service call, and they were correct!
I am watching an old Di520 run and after a few copies it would jam in the finisher. I would watch and it looked like the finisher was running a little slower than the body of the machine. I told myself that is was not possible. I continued to watch and it continued to look like it was slower. I took the covers off and watched again. Still the timing was off. I look closer and there seems to be something on the gears. I touch it and it was sticky. I smell it and it smells sweet. After thinking for a moment, I realized they had spilled a Mellow Yellow down the finisher and the stuff had dried to a thick syrup and was gumming up the works. Hosed it down with WD-40 and it worked fine.
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