Performed the maintenance for both furnaces, checked all motors, controls, and safeties. Started up and cycled the furnaces, checked gas pressures and performed a combustion test on each furnace. The second floor furnace seems to have an issue getting gas across the crossover tube and not always allowing burners two, three, and four to ignite, I'm going to call technical support to see if there is any type of a service memo on this. As of this time both furnaces are operating and working properly.