Tech preformed CMA FULL SERVICE on 2 Gas Package Units and 2 Wall Mount Heat Pumps. Tech noticed that Gas Pack #1 was documented in January of 2024 to have failed control board. During the inspection tech found that board had been replaced by another HVAC Contractor and System was back up and operational. Tech did find that the compressor did fail megohm test. This indicates the insulation around windings is damaged or gone, this causes compressor to be highly subjected to future failure. Due to age of system, Tech recommends replacing. Also During inspection tech found Gas Pack #2 not operating. Tech found thermostat indicating system was operating but system was not. Tech found no voltage at thermostat. Thermostat was operating on battery backup. With further investigation tech found system had insufficient power at unit. Tech found only one leg of 3 Phase power to have only 178v, while the over 2 legs had none. Tech checked fuses in disconnect and found them to have continuity. Tech