I recently had to repair my trap heater and turbo controller on my GCMS. Once I made the repairs, I reassembled the machine but I am now getting a 7% vacuum speed. I have poked around looking for the source of my leak but I am not sure on how to go about it. With this I have noticed a leak within the transfer line. Whenever I push the line all the way in (not yet in the locking position) I can hear/feel the pressure building up against the line. But once I twist the line and lock it in place, the pressure is alleviated.