The PV plant shows inhomogeneous amount of soiling. There is evidence of both partially open and connectors with abnormal temperatures. Furthermore, the installed modules are hotspot sensitive. It is recommended to (i) increase the cleaning frequency with an appropriate cleaning method, (ii) install an irradiation sensor (iii) continuous cleaning of the inverter-fan filters, (iv) replacement of warm module connectors and (v) yearly thermography inspection of the modules. The estimated production boost expected by the retrofitting actions lies between 5 -10%.