Open lids thoroughly, check inlet and outlet baffles and tees, file cracks or deterioration

https://mag-wiki.win/index.php/Budget-Friendly_Sewage-disposal_Tank_Cleaning:_Expert_Tips_and_Local_Solutions

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