Found Reach-In Cooler unit off. Put gauges on system and started unit. Found pulling 8n to a vacuum in a few seconds, suspected low on charge. Used leak detector on system and definitely leak around evaporator. Removed evap shroud and inspected coil. Charged system with nitrogen to 200psi and coated evap coil with leak bubbles. Found leak at bottom left of coil. Evaporator will need replaced. Unable to find parts manual for unit to get quote for coil. Will have to call manufacturer tomorrow for part information.