Performed pm on gas boiler Brushed and vacuumed burner tubes Inspected and vacuumed burner, blower and surrounding area Checked electrical connections and safeties Checked gas pressure Cleaned and inspected flame sensor Performed combustion test Inlet pressure- 8.215 in.w.c. Manifold pressure- 3.435 in.w.c. 11.3% o2 0ppm co