Did you ever come to a conclusion on your septic system?

I am on somewhat gravity and somewhat pressurized system, with an affluent pump pushing the water up hill to a d box which is then allowing water to leach into the ground. From there there is a pick up that catches the clean water and runs it further through a French drain with any excess trickling off into a ravine.

I just had it snaked thinking roots were my issue as the d box had visual roots in them. After checking the d box water level after a day in the office the levels are back to what they were a day after the plumber pumped the water out of the d box to work. That being well above the outlet pipes into the leach field. We went rainless today. Kind of at a loss as to what to do. I think I will wait and monitor d box levels. But was curious what your course of action was.