Upon my arrival I performed a 6 month checkup on 2 RTU package units. Flushed and treated water removal systems, washed condenser coil using water, cleaned and treated electrical cabinets, changed all air filters then verified system safety and performance. I found RTU#1 to be operating within manufacture specifications. RTU#2 I found bacterial growth inside the blower cabinet and on the blower wheel. I recommend having the air movement system pulled to be disassembled for chemical cleaning. I also recommend adding power protection to both systems to prevent any failures caused by power outages, brown outs or voltage spikes. options will be emailed over for review.