I am a professional HVAC technician who works for a company in Tucson, Arizona. I was called to a job where a transformer had to be installed in a customer's home. When I arrived, I found that the transformer was not the correct size for the customer's needs. I had to return to the company's warehouse to get the correct transformer and then return to the customer's home to install it. The installation took several hours, but I was able to complete the job successfully. The customer was very pleased with the work and thanked me for my help.