Performed ac pm. Replaced all filters. Flushed out all drains. Inspected all coils and blowers. Checked capacitors and contactors. Tightened electrical connections. Ran ac and checked operation. Measured amp draw of compressors, od fans, and blowers. Checked delta air temps at both coils. Let systems satisfy thermostats. Units are operating normal in ac mode. Customer explained that HeatPump froze over the winter but they didn’t call for service, just shut it off because they won’t use it much. Found unit not going into Defrost manually or automatically. Outdoor ambient and defrost sensors are connected to board and cannot be removed. Quoting customer to replace Defrost Board with Sensors. Customer would like to have heating pm done on 10/17 if possible. Please follow up with customer to confirm.