Open lids carefully, check inlet and outlet baffles and tees, document cracks or deterioration

https://wiki-stock.win/index.php/Trusted_Septic_System_Emptying:_What_to_Get_Out_Of_Professional_Crews

Open lids carefully, 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.