A/C not cooling - low side pressure shows very high pressure reading

What is your question?

added refrigerant R134a 2 bottles few weeks back since A/C was cooling well, the low side pressure was around 25psi and after adding 24 oz of R134a the pressure was around 40psi. However after few days of good cooling, the a/c stopped working. The low pressure side is showing higher than normal pressure. Could this be a expansion valve issue ?