Customer noted system making shuttering noise and turned off boiler until our arrival. Checked boiler operation - system appears to run normally at this time. Boiler internal pump amperage is .76 and is rated for .76 amps. Boiler burner appears to be degrading - recommended to replace burner with the WM maintenance kit that includes burners, gaskets, ignitors, pilots, everything included in the combustion side of the boiler.