We performed a detailed diagnostic and preventative maintenance service on a Generac standby generator in Montgomery. Our team evaluated the system’s performance, addressed an active alarm code, and inspected the transfer switch to ensure seamless power transitions. We replaced the oil filter and performed comprehensive voltage testing on the battery and control circuits using precision multimeters. By resetting the Evolution 2.0 controller and verifying the weekly exercise schedule, we restored the unit to full operational readiness.