Performed furnace check on Lennox furnace. Customer had inspector list issues that needed address. Inspector noticed water leaking onto condensation line. Water leaking from suction line having roughly 1 inch of uninsulated pipe. Was able to manipulate insulation to cover line completely. Customer also had concerns with calcification and rust on burners inducer motor and flue pipe. Parts on order, should receive parts within 3-7 business days. Will return when parts arrive to replace corroded parts. 3 ppm co in flu. 10 %o2. Cleaned flame sensor. Will return as soon as possible to make corrections Returned to complete furnace repair. Replaced burners, inducer motor/adapter and flu pipe. Started furnace to confirm operation and saftey. Unit running with 7.2o2 68 degree deltat. No issues upon departure.