AC cool check completed on one horizontal Carrier system. Drain line was flushed and treated. Condenser coils were cleaned. I found the condenser torque booster below manufacturer specs. There is also no surge protection on the indoor or outdoor unit. I presented repair options to the homeowner and he chose to replace the torque booster and add surge protection to both units today. I completed the repairs and cycled the system. Everything is working at completion of service.