The PV plant is heavily soiled. Some modules with mechanical damages were detected (broken modules and damaged frames). Cables hang under the modules and damaged cable conduits and MC4 connector were found. Interrow distance is insufficient. Structural earthing is incomplete and corroded. It is recommended to (i) increase the cleaning cycles, (ii) replace damaged modules and cables, (iii) retrofit the mounting structure, (iv) install a new earthing system, and (v) install a weather station or at least an irradiation sensor on the module plane to quantify and monitor the Performance Ratio. The estimated production boost expected by the retrofitting actions lies between 12% and 17%.