Refrigerant capacity of a prostar

[Nilao]

Was wondering if anyone knows the capacity on a 2011 prostar with thermistors. Think I have a bad expansion valve as it was squealing loudly and now is not cooling on that coil. The rear coil is blowing ice cubes so I know the systems working yet both high and low pressure lines are identical in temperature yet the expansion valve is cool and sweating. Going to do a evac and recharge but my capacity label is illegible.

Thanks,
Nilao