Honestly, laser alignment can be overkill for some gearboxes. We had a similar issue at a plant last year, and it turned out the foundation was shifting, so no amount of alignment held. Sometimes you gotta look at the bigger picture, like mounting surfaces or wear patterns. Seeing it run smooth is great, but if the root cause isn't fixed, it'll be back in a month. Just my two cents from dealing with vibrating pumps all day.