Performed furnace clean and tune; inspected the exhaust and intake PVC ensuring all connections were secured, removed and cleaned the burners along with the flame sensor, cycled the system on and checked gas pressures, as well as performed a combustion test verifying no CO in the airstream. This system is 25+ years old and is showing signs of wear the blower motor tested weak at 54%. Due to the age, condition, and cost to repair I highly recommend replacement of the system as opposed to repair. This system is currently operating normal at this time. Job complete