Arrived for a furnace maintenance. Static was high. Opened vents and changed filter, no change. CO levels were above 50 and reached up to 200. Cleaned flame sensor, checked heat exchanger, checked rollback sensors. Inducer motor struggling to keep up, running inconsistently. Blower wheel dirty. Quoted new inducer motor. Customer decided to take on repair himself. Rescheduled other system maintenance for march 18th,