I performed a single system maintenance. I checked amps, capacitors, filter, electrical, refrigerant, cleanliness, and drains. I checked the system in heating mode because the temperature was in the 50’s and the thermostat would not let cooling come on. I observed a decent amount of growth forming in the airhandler cabinet, build up on the blower wheel, and debris stuck in the evaporator coil. When checking the refrigerant, I noticed the pressures are not in normal ranges and became concerned. I would like to return at a later date when it is warmer to take another look at the system in cooling. I am almost certain that at least the liquid line dryer has gotten clogged.