Gas Recirculation Valve (egr Valve) problems of the 2003 Buick Park Avenue

S10 appropriate handling re problems with 2003 Buick Park Avenue possible safety recall issue for intake manifold and gasket. The consumer stated he received a call from a gm executive assistant responding to a letter that was sent to them. She dismissed the consumers concern because he didn't take the vehicle to an authorized dealer for the repair when the parts failed a second time. However, both technicians who repaired the manifold and gasket within a two- year period told the consumer the oem replacement parts were substandard. The parts were made of plastic and had degraded.