Customer concerned about fault error code on thermostat. Error 75. Checked operation and located low refrigerant charge level low. Visible leak showing on refrigerant tube leading to heat sink on master control board. Needs level 1 refrigerant leak repair with refrigerant recovery and thermo paste to be reattach to master control board heat sink. Called Amana tech support (Wilson) to confirm repair for heat sink tube. Heat sink tube repair and checked operation. Unit cooling and drains at this time.