Cable layout with loosely hanging cables were found. Modules with cell breakage and burned cells were connected to the system. Modules were shaded by a taller room and water tank. It is recommended to (i) optimize cable layout, (ii) replace modules with broken glass and burned cells, (iii) re-sort lower performing modules, (iv) re-string shaded modules, and (v) install a weather station. The estimated production boost expected by the retrofitting actions lies between 4% and 8%.