amal valve is ontop of the gearbox, circle thing with 3 hoses coming off of it, hoses goto airbox, turbo housing (or crossoverpipe, depending on how its set up) and wastegate actuator

also has 2 electrical connections on it.

unless ofcourse it has a bleed valve fitted betweena hose running from turbo to actuator... in which case ignore the amal valve coz its been bypassed and its not your problem