The unit next door had caught on fire and the customer was concerned about the wall that is adjacent to them. On the adjacent wall are a couple of receptacles which I had pulled out to check the insulation to verify that nothing was melted or showed signs of over heating. I removed some ceiling tiles back to check for any damage and none was found. Due to a firewall being installed and the outlets are in between the walls it appears the firewall did its job. Another note to consider is if any wires were melted inside the pipes the copper conductor would make contact to any metal ground and shut the breaker off and when I arrived the breakers were on and so where the outlets. I shut off the breaker that controls the A/C unit on the roof top and verified with my meter that I was at the correct unit. The A/C disconnect is rusted and should be replaced. I also found a wiring issue inside the disconnect as well that would be addressed with a replacement. Other issues found not pertaining