Went for a tune up 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 small crack was detected when inspecting. Did show customer finds and concerns. Checked temp split and is passing for specifications. Did replace filter for customer. Cleaned flame sensor and pressure switch hose. Checked water panel on humidifier and will recommend to replace. System is up and running before departure. Thank you for choosing LBA services-Johann