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

https://wiki-coast.win/index.php/Trustworthy_Septic_System_Emptying:_What_to_Expect_from_Expert_Teams

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