This unit was not cooling well. The compressor would run for about a minute and then be off for about 5. After removing the unit and cleaning the coils with water and some coil cleaner on the condersor coil, it ran continuously for about half an hour. When I checked on it again it was back to the short compressor run time. There are no access ports. The filter drier was cool. The capillary tubing was sweating and the hot gas line was burning hot. It was in the 80's outside. The discharge air was 51 deg. F into a 73 degree room. It was manufactured May '88. The unit would reverse itself and go into the heat pump mode. I have not worked on heat pumps before. I know that very often you need specific pressures and temperatures as well as superheat and subcooling values to really know what is going on. The amp draw of the unit in cooling was 7.2 and the compressor FLA is 6.9. One leg of the 208 measured 7.0 amps. I suspect that the units amp draw is too low. Has anyone seen this result with an old GE zoneline? Would you recommend soldering on access valves and checking the charge?