Preventative maintenence inspection on Mitsubishi three head ductless mini split system. Test ran system in cooling on all 3 heads. Temperature drop for each head is within spec. Did not check refrigerant pressures as there is no issues suspected at this time. Disassembled each head to properly brush out air coils. Pictures of each head uploaded to file. Water flush all air filters and air filter inserts. Reassemble heads and install clean filters. Hose water flush outdoor unit air coils to remove dirt and debris. All systems are operating properly, efficiently and ready for Summer.