I arrived at the client's home to perform maintenance on their AC system. Upon inspection, I discovered that the compressor was hitting the limit switch, causing the system to operate inefficiently. Despite my best efforts to restore the system to its original condition, I was unable to do so. The client inquired about the cost of a new system, so I provided them with a quote and explained the benefits of upgrading to a more efficient model. I also ensured that the client's comfort was maintained during the process.