Unit is tripping out on freeze protection. Sniffed the evaporator coil and found a small leak on the back side of the coil. Tested and confirmed that the system was low on refrigerant. Talked to customer about the issues. The coil is obsolete and the refrigerant that the unit has in it is getting phased out. Talked to Jamie and we need to set up a second opinion. Took measurements and pictures of the unit. Thanks Brad