After doing some trouble shooting with Sean at Ivoclar. Replacing a few push to connect hose fittings in a couple spots. I wound up having a clogged push to connect hose fitting at the barbed end where the vacuum hose connects . Typically this is not common. We came to the conclusion that after many years of operation that dust began to collect there as it was sucked out of the muffle chamber Hope this helps someone in the future.