Went for a maintenance call today for heat. Tested for static pressure system is passing when in heat for all 3 systems.All electrical components are passing for manufacture specifications. Did a combustion test is within range. Inspected heat exchanger no cracks/leaks were detected in all 3 systems.Checked temp split and is passing. Did replace filter for customer for all. 3 systems. Cleaned flame sensor and pressure switch hose. Did fix wiring for system 1. As well replaced water panel for system 2. All systems are up and running before departure. Thank you for choosing LBA services-Johann