Arrived to replace TXV at air handler Before pumping system down I checked Freon pressures to indeed find that the valve was not metering correctly with a current evaporator temp of 33 almost 32 degrees with a lower suction pressure. This is a strong indication of why the system was not keeping temp on hotter days and reasoning on why system froze up the other day. Replaced expansion valve pulled vacuum on system. Checked operation to find much better coil temp and pressures. Was no needing of adjustment for valve which is very promising. Made Mr. Johnston aware of everything in the above text and also have a time stamped photos of when I arrived current temp in home when I started system back online and when I finished running system. The home has cooled back down to set temp while on site!