Performed 1 system diagnostics in a 2009 Carrie lr furnace: I found that the flame sensor was dirty and the blower motor capacitor had almost completely failed; blower motor sometimes would not be able to run. With the homeowners permission; I cleaned the flame sensor and replaced the blower motor capacitor. I also flushed the drain line with gallons of water and I added enzymes and clean out tablets. I replace the air filter 1) 16x30x1. I run the furnace multiple times and verified that it was operating and heating at the end of service call. I monitored the home for Carbon Monoxide with my detector after the furnace has been running for an extended period of time 0 ppm found. I emailed several estimates for recommended repairs to prevent future system failures and to help prevent water damage to the home. Homeowner advised me that she is on a fixed income. The drain line needs more of a slope, the flue pipe needs to repaired (partially replaced with new flue pipe, a new inducer mot