I responded to a service call for a malfunctioning walk-in freezer in Salem, MA earlier this week. Upon arrival, I measured the return air temperature at 28°F, well above the desired setpoint. I performed system diagnostics and determined the issue was a failed evaporator fan motor. I sourced and replaced the 1/2 HP PSC motor and its capacitor, which resolved the malfunction. I evacuated refrigerant lines and recharged them with R-404A to factory specifications, ensuring the freezer maintained -10°F and preserved the client's perishable inventory. I also recommended adding strip curtains to reduce air infiltration and improve energy efficiency.