Brushed and vacuumed burner tubes Inspected and vacuumed burner compartment and surrounding area Checked electrical connections and safeties Checked gas pressure Performed combustion test Inlet pressure- 7.083 in.w.c. Manifold pressure- 3.10 in.w.c. When arriving the customer said the 1st circ pump was not working properly and had no heat for that zone. After investigating we found the bearing for the pump was very stiff and the coupling had snapped. After getting customer authorization we replaced the coupling and added oil to all circ pumps. After replacing the coupling and adding oil we found the bearing is still slightly stiff. Would recommend replacing the circ pump before the bearing completely seizes. Checked the coupling for the last circ pump and found the set screws are very rusted and corroded making it impossible to replace the coupling. Would recommend replacing the pump before the coupling fails.