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Try a half-way test: stop the printing process (printing one page, for simplification's sake) by opening a cover or the like, while the paper is half-way through the printer. Remove the paper, note where you removed it from, and look at it for indentations.
- If it is marked, then the problem is in the paper path *before* where the paper stopped.
- If it isn't marked yet, then the problem is in the paper path *after* where the paper was stopped.
- and if the paper is partially marked, then the place where the marks stop, is about where the problem is located.
If it isn't marked yet, you narrow it down by stopping the next one-page test print, when it is farther along in the printer.