Replace A/C Unit or add refrigerant?
The 58/196 pressures mentioned is the low (suction) side pressure and the high side pressure.  Those aren't horrible values since I believe 68/250 would be typical.  If the system was 33F outside, then that is cooling better than 40F, so you should be fine there.
Is there any chance that your evaporator inside the house froze?  That can happen if humidity is high and the air flow is too low.  The solution is to turn off the A/C and leave the fan running until the ice melts.
If it working again, check your airflow.  You mentioned that you replaced the blower motor -- did you happen to change the fan speed to a lower setting at the same time?