Upon my arrival to la grange, tx., i performed repairs to ac system, checked operations on equipment found ac systems to be working good at this time, replaced exhaust motor on RTU 4 , fixed charge on RTU 7 and cleaned drain pan on RTU 8. Found that RTU 6 was still not reading properly replaced thermostat and system now is working good. Customer wanted return grills cleaned, but cleaning them in place is not possible since they have grease but thing to do is remove them and take them outside to clean with cleaners. Will create a estimate.