Customer informed me that AC. wasn’t working and there was a buzzing noise when it was trying to run. Upon inspection, I discovered the buzzing noise was due to the compressor trying to start. However, compressor was unable to start because of failed start assist kit. I replaced the start assist kit with new warranty part and tested operation. AC precision tune up. Clean and tune up AC; cleaned condenser coil, checked all outdoor electrical components, tested indoor air flow, checked refrigerant levels, and tested overall AC operation.