Went for a maintenance call today for heat. Tested for static pressure system is passing when in heat. All electrical components are passing for manufacture specifications. Did a combustion test is within range. Inspected heat exchanger no cracks/leaks were detected. Did notice some rust in the eye lids of heat exchanger and showed customer.Checked temp split and is passing. Cleaned flame sensor and pressure switch hose. Did replace water panel for customer and humidifier is running.System is up and running before departure. Thank you for choosing LBA services-Johann