Upon arrival to schedule system maintenance, I was shown to an air handling unit located in the upstairs closet. Space. The homeowner immediately informed me that the system had been off and non-operational for the past month. I switched over to a service call. Upon initial diagnosis of the no cooling/no heating I found the low-voltage fuse to be popped, causing the system to not be able to run in any mode. Started to diagnose the issue and found the wiring for the heater kit to have shorted. The heat kit needs to be replaced to restore, secondary heating to the system. I’m also recommended replacing the thermostat wiring just to avoid any low-voltage shortage issues in the future. Changed out the systems, low-voltage fuse and start the system in the cooling mode. The system is operating in the cooling mode, but upon opening the air handler cabinet. I found very significant amount of oil all over the evaporator coil. Refrigerant leaks with oil. Went outside to verify refrigerant p