The PV plant has several broken or damaged modules. O&M staff was spotted to walk on the modules. Some of the modules are extremely dirty. Objects laying under the modules have been found and some back sheets are extremely dirty. Some parts of the sites are affected by heavy near shading. It is recommended to (i) improve O&M activities and cleaning cycles, (ii) restringing of the shaded modules, (iii) install an irradiation sensor, and (iv) clean up the objects laying under the modules. The estimated production boost expected by the retrofitting actions lies between 11% and 17%.