Arrived at customers daughters residence and I was greeted by the customers father and was led to the attic area and found that furnace was not running upon arrival. Inspected flame sensor and it is clean at this time. Inspected ignitor and it is functioning properly at this time. Inspected inducer draft motor and itnis functioning properly at this time. Inspected pressure switch and it is not functioning at this time.. inspected exhaust and found no blockages at this time they are primed and glued and and also pitched properly at this time. Also inspected evaporator coil and it is dirty at this time. Mr Presley advised me that they are not looking to replace system at this time. Used inspection camera to look inside and outside of heat exchanger and found a couple suspicious area in exchanger.. inspected all drains at they are clear at this time. Reset roll out switch and it is resetting and system will ignite and run for several minutes and then drop out on roll out trip and then