Open lids carefully, check inlet and outlet baffles and tees, file fractures or deterioration

https://golf-wiki.win/index.php/Do_It_Yourself_Prep_and_also_Pro_Tips_for_Suitable_Septic_Tank_Pumping_as_well_as_Post-Service_Care

Open covers thoroughly, check inlet and outlet baffles and tees, document fractures or corrosion, and repair seals to stop groundwater invasion and exfiltration that can overload the drainfield.