Performed furnace maintenance on a house with 2 Lennox systems. Left wing of the house duct runs are tight and free of any obstruction. Condensate lines are clear. Combustion blower is amping within range. Flame sensor was cleaned and reinstalled. Primary blower motor is leaking oil which is a sign of failure. Ignitor is reading out of range. Temperature split is right in range. The Right wing of the house needs a upsize in duct going to one of the rooms. Combustion and primary blower motors are in range and spinning freely. Ignitor and flame sensor read in range and were cleaned. Duct runs look tight and free of obstruction. Single start control is also reading within spec. Both units were were cycled before departure.