Arrived to do a performance maintenance. Started inspection inside and measured a temperature split between return and supply air. Measured power consumption of the blower motor and checked system for cleanliness. Found that the evaporator coil is heavily coated in bacterial growth. Performed a static pressure test and found that the system is operating beyond manufacturers specifications. Adjusted fan speed to the proper setting and found the system is still operating with failing static pressure. Reached out to a field supervisor to finish the diagnosis on the systems static pressure. Went outside and verified system refrigerant charge. Verified operation of all mechanical and electronic components of the condenser. Rinsed condenser coil free of debris. Spoke with homeowner about the system. Air conditioning system is operational at this time.