Open covers thoroughly, check inlet and outlet baffles and tees, document fractures or deterioration

https://alpha-wiki.win/index.php/Dependable_Sewage-disposal_Tank_Emptying:_What_to_Anticipate_From_Expert_Crews

Open lids thoroughly, check inlet and outlet baffles and tees, file cracks or rust, and repair seals to stop groundwater invasion and exfiltration that can overload the drainfield.